VIEW OF THE SCIENCE OF LIFE.
CHAPTER I. FUNDAMENTAL PROPOSITIONS.
I. —ALL living bodies possess a certain property, capable of being acted upon by external powers, so as to produce the phoenomena of life.
THIS property is denominated EXCITABILITY. *
II.—THE external powers are all such objects as, applied to the whole, or a part of any living body, are capable of acting upon the excitabili [...]y.
THEY are denominated STIMULI, or EXCITING [...]WERS.
III.—UPON the application of the exciting powers [Page 30] in a due, deficient, or excessive degree, depend the different states of the excitability.
IV.—UPON the different states of the excitability depend all the phoenomena of health, and disease.
V.—THERE are three states of the excitability.
1st.—THE state of ACCUMULATION.— When a portion of the usual stimuli is withheld, the excitability accumulates; and the body becomes susceptible of impression, in the direct ratio of the subduction.
THIS state constitutes diseases of ACCUMULATION, or of DIRECT DEBILITY.
2dly.—THE MIDDLE state. When the excitability is such, that the application of the accustomed degree of exciting powers, produces TONE, or HEALTH.
3dly.—THE state of EXHAUSTION. When the application of stimuli, has been greater than that which produces healthy action, the excitability is exhausted; and the body becomes less susceptible of impression, in the direct ratio of the access.
THIS state constitutes diseases of EXHAUSTION, or of INDIRECT DEBILITY.
[Page 31]VI.—THE states of accumulation, and exhaustion of the excitability, in their different degrees, constitute all the diseases, to which living bodies are subject.
VII.— DISEASES differ from each other, only in the degree of accumulation, or exhaustion of the excitability in the whole, or parts of the body.
VIII.—CONSEQUENTLY, as two degrees of the same state, or two different states of the excitability, cannot take place at the same time, in the whole, or any particular part of the body, two diseases cannot possibly co-exist, in the whole, or a particular part.
IX.—THE cure of all diseases depends upon an application of stimuli, in a degree proportionate to the accumulation, or exhaustion of the excitability.
X.—THE degree of power, with which the functions of life are performed, is expressed by the term EXCITEMENT. Thus, there is a healthy excitement, when the functions of life are justly performed. But in proportion as a deviation from health takes place either in direct or indirect debility, so the functions of life are performed with less power, or the excitement is diminished.
CHAPTER II. OF STIMULI, OR THE EXCITING POWERS.
XI.—ALL objects in nature, capable of producing an effect upon living bodies, are stimulant, (11.)
XII.—STIMULI, may be divided into ordinary, and extraordinary.
1st.—ORDINARY stimuli, are all such powers as are usually applied to living bodies, in a state of health.
2dly.—EXTRAORDINARY stimuli, are such as are occasionally applied to living bodies, as noxious, or may be used, as curative powers. Of this description are all the active substances that are or may be employed as medicines, whether animal, vegetable, or mineral.
SUBSTANCES usually called POISONS, as their deleterious operation depends wholly upon their superior degree of stimulant power, ought not to be distinctly considered. Any stimulant, when exhibited in sufficient quantity to exhaust the excitability, acts as a poison.
[Page 33]CONTAGION has been enumerated as a cause of pestilential diseases. But as the existence of such a power is by no means proved, it ought not to be admitted in philosophical disquisitions. The grounds of dissent, from an opinion so universally received, will be fully explained in another place.
CHAPTER III. APPLICATION OF STIMULI, OR THE EXCITING POWERS, FOR THE CURE OF DISEASES.
1. Diseases of direct Debility, or of Accumulation.
XIII. As the body becomes susceptible of impression, in the direct ratio of subduction of stimuli (v. 1.), it follows that the force of stimulus to be applied, in the cure of diseases, of this state, should be inversely as the accumulation of the excitability. Thus in the case of persons who have been exposed to great degrees of cold, heat should be applied, first in a degree not much greater than the lowest temperature, to which the person has been exposed, and gradually increased to the usual standard. To frozen limbs, the [Page 34] first application should be snow, then cold water, afterwards water less cold, and so on, through the various degrees, until motion and sensation are fully restored. Whereas, by the immediate application of the accustomed degree of heat, death would be produced in the whole, or those parts of the body, which had been exposed.— To persons who may have remained long without food, nourishment should be exhibited in the same gradual manner. The quantity usually taken at a meal would, in such a case, instantly extinguish life,— a fact of which there are many instances upon record. The eyes of persons, who have been long kept in darkness, become exceedingly sensible to the smallest degree of light. Those unfortunate beings, whom the mistaken and perverse policy of man has doomed to long confinement in dungeons, become, in the course of time, capable of distinguishing all the corners of their gloomy abode; where, upon their first entrance, they could distinguish nothing. The impression of the full glare of a meridian light, upon organs in such a state of susceptibility, would occasion instant and irrecoverable blindness. A person, suddenly awoke in the night, can scarcely bear even the small degree of light, emitted from a common candle. It is only by the gradual approach of day, that the eye is enabled to bear the full force of the mid-day sun.
[Page 35]SCURVY seems to be a disease of direct debility, occasioned by the absence of some of the usual exciting powers, particularly nutritive food, heat, and the mental stimuli. These powers must be gradually applied, in order to re-produce health. Upon this principle it is, that vegitables and vegitable acids, as being less stimulant than fresh animal food, are found so useful in the cure of scurvy. An immediate indulgence in the latter, after a long abstinence, would produce dangerous consequences. In advanced stages of this disease, a very small quantity of stimulus, such as a glass of ardent spirits, or a strong mental impulse, has been frequently known to extinguish life. That diminution of heat has a share in the production of scurvy, is evident from its more frequent occurrence in cold, than in hot climates. And that the absence of the mental stimuli, is often a source of this disease, is obvious from this,—that every circumstance that can occur, during a long voyage, calculated to rouse the mind to moderate exertion, will produce an alleviation of the symptoms;—the sight of an enemy—the sight of land—approach to the destined port—the anticipation of the pleasures of the shore, &c. This is farther corroborated by the frequency of scurvy among the enslaved Africans, in their passage to the West Indies, where all the mental stimuli are as completely abstracted, as can be supposed to happen in almost any [Page 36] possible situation. The disease in this case affects the men, more than the women and children. The reason is evident. With men, the transition from liberty to slavery, is greater than with women and children, accustomed, in their most free state, to look up to them as their superiors. The minds of the latter too, from being less exercised, are the less capable of reflection, and become more easily reconciled to their new situation; which is also rendered less irksome, by the indulgence usually granted to them, even on board of ships, employed in the vile traffic of slaves.
THE absence of those objects, which were wont to excite pleasurable sensation in the mind, produce diseases of this state.—Such is the despondence of a lover, in the absence of the object beloved: and that melancholy, with which some persons are affected, when absent from their native country.
XIV.—AS the situations, in which the ordinary stimuli can be with-held, in any considerable degree, are rare, the diseases of this state are consequently few in number; and seldom become objects of medical treatment.
XV.—IN all of them, the cure consists in a gradual re-application of those exciting powers, [Page 37] the abstraction of which occasioned the disease; or, in situations where that is impracticable, by a similar application of other powers equivalent in force.
2.—Diseases of indirect Debility, or of Exhaustion.
XVI.—AS the body becomes less susceptible of impression, in the direct ratio of the excessive application of stimuli (v. iii), it follows that the force of stimulus to be applied, in the cure of diseases of this state, should be directly as the exhaustion of the excitability.
XVII.—AS all diseases arise, either from accumulation or exhaustion of the excitability, (vi.) and as the diseases of accumulation have been shewn to be extremely few (xiv), diseases of indirect will probably be to those of direct debility, in some such proportion, as nine hundred and ninety nine to one. The diseases of warm climates may be considered, without exception, as diseases of exhaustion, or of indirect debility.
XVIII.—AS the highest excitement is the greatest degree of health, it is evident that, in disease, health is to be reproduced, by the application of such a degree of stimulant power, as is calculated to support the highest state of excitement, of which the body, at the time, is [Page 38] capable. Let the middle state of the excitability for instance, be represented by 20, and the appropriate degree of stimulus, producing healthy excitement, by 20 also (vide Table); let the diminishing or increasing sum of stimulus, in proportion to the accumulation or exhaustion of the excitability, be represented by numbers, as in the annexed table. If the excitability is exhausted to 10, the sum of stimulus to be applied, in order to produce the greatest excitement, which the state of the body will allow, will be as 30. Every degree of stimulus, beyond that, will exhaust the body still farther, and every degree, below it, will retard the cure. Thus 35 degrees of stimulus will be too much, 25 too little.
XIX.—AS the production of the healthy state is always gradual and progressive, and is effected by the powers of life; it follows that, in proportion to the degree, in which these powers can be maintained, the cure will be accelerated. There is no other mode of supporting them, but by an application of stimuli, proportionate to the susceptibility of impression.
XX.—AS the sum of the powers, producing disease, cannot possibly be ascertained, the degree of stimulus to be applied, for the reproduction of health, must be entirely regulated by observation [Page 39] of the effects, arising from the application of medicines.
XXI.—AS the varieties of diseases that occur, from the highest degree of accumulation, to the lowest degree of exhaustion, of excitability; so is the variety, in the degree of stimulus, necessary to be applied, for the cure.
XXII.—THIS variety is of very great extent. The usual mode, therefore, of prescribing certain fixed doses of medicines, in every disease, whatever may be the degree of it, is and must be nugatory and inefficacious; excepting when these doses happen, by mere chance, to correspond with the state of excitability.—In ascertaining these degrees, and proportioning the stimuli, consist the judgment of the physician.
XXIII.—IF, for example, opium, aether, volatile alkali, the preparations of mercury, wine, bark, &c. exhibited in the usual doses, do not produce effects, which indicate an approximation to health,—such as a diminution of frequency, * and an increase of strength, in the pulse, a coolness of the skin, moisture of the tongue, refreshing sleep, and the other familiar signs of increasing [Page 40] excitement,—it is evident that the doses are insufficient, and should be increased, until these effects are produced.
XXIV.—THE doses should be repeated in such a manner, as to maintain the highest degree of excitement, of which the body, at the time is capable. But in proportion as the excitability accumulates, or the body approaches to the state of health, the doses should be gradually and proportionally diminished, until at length, health being established, nothing more than the action of the ordinary exciting powers is required.
XXV.—ALL the diseases enumerated by Brown, as diseases of accumulation or direct debility, with perhaps the single exception of scurvy, are diseases of exhaustion. Typhus, Intermittents, Dysentery, and some other diseases, as they appear to be occasioned by exposure to cold, and moisture, a deficiency of nutriment and of other stimuli, have been ranked, by him, in the class of diseases of accumulation. But as the sum of the powers, which are concerned in the production of any particular disease, cannot be ascertained, the nature of it can only be determined by the effects of the stimulant powers, applied for the cure. And, as the cure of these diseases depends upon the application of the most powerful stimuli, it necessarily follows that, they are diseases of indirect debility.
[Page 41]THIS error seems to have arisen from an opinion, that upon the abstraction of stimuli from (or in the the words of Brown, the application of directly debilitating powers to) a body in a state of exhaustion, the irritability would accumulate; or that direct would be superinduced on indirect debility. But this opinion is evidently erroneous. If from a person labouring under plague, malagnant fever, or gangrenous sore throat, all the usual remedies are with-held, and only cold water given, no accumulation of the excitability will take place; but on the contrary, the exhaustion will rapidly proceed, to the extinction of life. If a person, previously exhausted by exposure to excessive heat, drinks largely of, or plunges himself into cold water, the exhaustion will not be removed; but on the contrary, those greater degrees of it produced, constituting Tetanus, Spasms of the stomach, &c. And that these are all diseases of indirect debility, the mode of cure, which consists in the application of a very high degree of stimulant power, is a sufficient proof. Gout is a familiar instance in point. The state of body liable to this disease, is produced by a long continued application of food and drink, stimulant in too high a degree. Let a gouty person be exposed to cold and moisture, and a paroxysm will readily be produced. Let him suddenly refrain from his usual quantity of [Page 42] food and drink, his stomach or head will be affected; and the most powerful stimuli, as Aether, Brandy, &c. will be requisite to relieve him.
XXVI.—HENCE it follows that, in diseases of exhaustion, the irritability does not accumulate upon the abstraction of stimuli; but on the contrary, the state of exhaustion is, thereby, increased.
XXVII.—IT follows also that, in the production of Typhus, Intermittents, Dysentery, and such other diseases as have appeared to arise from exposure to cold, moisture, &c. and have therefore been ranked by Brown, among the diseases of direct debility, the body must have previously been in a state exhaustion. By a subduction of exciting powers, from a body in such a state, the previous degree of exhaustion must be increased, and the diseases of that state consequently induced.
XXVIII.—MOST of the diseases of exhaustion appear to be produced in this manner.
CHAPTER IV. OF DISEASES DENOMINATED BY BROWN, DIEASES OF EXCESSIVE EXCITEMENT. *
XXIX.—AS there are three states of the excitability, (v. 1, 2, 3) so there are three corresponding states of excitement.
[Page 43]1st.—THE state of diminished excitement, from a deficient application of stimuli, corresponding with the state of accumulation, or direct debility.
2dly.—THE state of high excitement, from a due application of stimuli, corresponding with the middle state of the excitability or health.
3dly.—THE state of diminished excitement, from an excessive application of stimuli, corresponding with the state of exhaustion, or indirect debility.
XXX.—ALTHOUGH the stimulant powers may be applied, in an excessive degree, to the middle or healthy state of the excitability, it is evident that excitement never can be excessive; for every degree of stimulant power, greater than is necessary to produce health, must occasion a degree of exhaustion proportionate to the excess, (v. 3); and every degree of stimulant power, less than is necessary to produce health, must occasion a degree of accumulation, proportionate to the deficiency. (v. 1.)
XXXI.—THERE are, therefore, no diseases of excessive excitement. From whence it follows that those, which have been so denominated by Brown, must be diseases, either of direct, or indirect debelity (vi.)
[Page 44]XXXII.—THAT they are all diseases of indirect debility, seldom constituting a very high degree of exhaustion, is proved, both by the powers that are known to induce them, and the remedies that are found most successful in their cure.
CATARRH, pneumonia, acute rheumatism, and other diseases of this class, are occasioned by the application of a considerable degree of heat, after the body has been previously exposed to cold;—or vice versa. The temperature of warm rooms is, in general, greater than is sufficient to support healthy excitement. If the body therefore has been previously exposed to a considerable degree of cold, the irritability must be accumulated (v. 1); and the application of a high degree of heat, to a body in that state, must inevitably produce exhaustion.
IF, on the contrary, a person has been previously exposed to a degree of heat, beyond what is necessary to support healthy excitement, and cold be suddenly applied, the same effects will be produced (xxv.)—In most of these diseases, a local affection takes place, which evidently arises, from some parts being more exposed to the exciting powers, than other parts of the body;—as the mucous membrane of the nose and fauces, in [Page 45] catarrh; the bronchioe and lungs, in pneumonia; and the extremities, in rheumatism. The mode in which the cure of these diseases is effected, viz. by warmth, small quantities of opium, wine, &c. and the application of fomentations, rubefacients, and blisters to the local affection, is a proof that they are diseases of indirect debility.
THE langour, inability to motion, want of appetite, nausea, costiveness, &c. which occur in these diseases, are evidently incompatible with such a state, as that of excessive excitement. Could such a state possibly exist, the functions of the body would be invigorated, in the exact degree of the excess.
IN convalescence from these diseases, it is well known, that a greater degree of nutritious food, wine, and other stimuli, are necessary, than in a state of health. But if they depended upon a state of excessive excitement, the cure could not otherwise be effected, than by persevering in an abstraction of stimuli, until health was re-established. The exhibition of stimulant powers would produce an increase of disease.
SMALL-POX and meazles are of this kind, and to be cured only by stimulant powers.
THE mode in which Brown fell into error, in [Page 46] considering some diseases as depending upon a state of excessive excitement, was probably this. Having still, (altho' contrary to one of his own fundamental principles "that all powers applied to living bodies are stimulant,"—in other words "that there is not a sedative in nature,") retained an idea, that those medicines, called evacuants, are debilitating; and having found that, under a moderate application of them, together with the other parts of the usual treatment, patients generally recovered from these diseases, he was led to conclude, that they depended upon a state of excessive excitement.
THE mode of action, however, of those medicines, seems to have been universally misunderstood. As all objects, capable of producing an effect upon living bodies, are stimulant (x), those which produce evacuations must necessarily be included. If a certain quantity of calomel, infusion of senna, salts, or any other cathartic medicine, be taken, its immediate effect, like that of opium, camphor, or any other acknowledged stimulus, will be an increased strength of pulse, a sense of general invigoration, and all the usual symptoms of increased excitement, in proportion to its degree. And this will continue as long as the operation of the medicine. If the dose is sufficient to produce a high degree of excitement, [Page 47] a discharge of natural foeces, when these have previously been long retained, will be the consequence. Is there any other mode, by which the intestines may be made to perform their functions, and to expel their contents, but by increasing their excitement? Certainly not —But if a greater quantity be given than is necessary, to enable the intestines to expel, with facility, their contents, a new disease is produced;—indirect debility is established; and a discharge of mucus, and sometimes of blood, accompanied by disagreeable sensations, follows; symptoms which are only to be removed by opium, and other stimuli.—It is not therefore with an intention of evacuating, that those medicines should be given. In diarrhoeas, and incipient dysentery, where the intestines are evidently in a state of indirect debility, calomel, castor oil, and all the other medicines called cathartics, instead of increasing, invariably diminish the number of evacuations; and, by a judicious repetition of the doses, cure the disease. Those medicines, therefore, do not effect cures, by their EVACUANT, but by their STIMULANT POWERS.
AS opium, aether, volatile alkali, wine, &c. when given in an improper manner, diminish; so the medicines, usually denominated evacuants, when given in a proper manner, increase the excitement.
CHAPTER V. LOCAL DISEASES.
XXXIII.—THE principles laid down in the preceding pages, respecting diseases, which affect the whole body, equally apply to those, which effect only a part.
XXXIV.—AS diseases, which affect the whole of the body, depend upon, either accumulation or exhaustion of the excitability (vi.); the same law must apply, with equal force, to any of its parts, separately considered.
XXXV.—IF that proposition (vi.) be true (as it undoubtedly is) it follows, that local diseases never depend upon a state of excessive excitement. Inflammation, therefore, alocal disease of the most frequent occurence, does not, as has been generally supposed, depend on such a state; but, like the diseases of the whole body, which have been denominated by Brown, diseases of excessive excitement, and by others inflammatory, is, on the contrary a disease of diminished excitement, from indirect debility; excepting in the single case of inflammation, produced by the exposure of any particular part of the body to a high degree of cold. As this proposition is of considerable importance, it may be necessary to enlarge upon it. The symptoms [Page 49] of local inflammation are heat, pain, redness, swelling; and, in secreting surfaces, an increased secretion. It is evident that, in inflammation, an enlargement of the vessels takes place without a proportionate degree of contraction; and that an increased quantity of blood flows into them.—As the effect of stimuli, upon the muscular fibre, is to produce contraction; and as the blood is the appropriate stimulus of the arteries; it is evident that, if these were diseases of excessive excitement, an increased contraction of the vessels, or a diminution of their diameters, in proportion to the increased quantity of the blood, would take place. If the vigour of a muscle is ascertained, by the force of its contraction, it is clear that every increase of vigour should be attended with an increased force of contraction. If local inflammation, therefore, was a disease of excessive excitement, there would be a diminution, instead of an increase, of the quantity of blood, in the vessels of the part. But that there is actually an encreased quantity of blood, in the vessels of the parts inflamed, is evident in opthalmia, and those inflammations, which are produced, in the course of experiments, upon the transparent membranes of animals. The same idea too is farther confirmed, by the mode of cure, which is universally adopted, and found successful, in those diseases. [Page 50] The application of blisters, and inhalation of warm steam, in pneumonia, catarrh, and inflammatory sore throat; of vinegar, and ardent spirits, in burns, and scalds; warm fomentations, and poultices, in phlegmon; solution of volatile alkali, tincture of cantharides, and the different preparations of camphor, in the inflammation of the joints, in acute rheumatism; tincture of opium, and solutions of corrosive sublimate in opthalmia; —are all so many proofs of the truth of this proposition.
XXXVI.—IN catarrh, pneumonia, acute rheumatism, phrenitis, and those other diseases of indirect debility, which have been called diseases of excessive excitement, the local affection, which arises from the parts being more exposed to the action of the exciting powers, differs from the general, only in being greater in degree.
XXXVII.—IN local, therefore, as well as general disease, the causes which produce, and the powers which cure them, tend equally to prove, that a state of excessive excitement cannot possibly take place, either in the whole, or any part of the body; and that the diseases usually considered as dependent upon such a state, are almost, without exception, diseases of indirect debility.
[Page 51]XXXVIII.—LOCAL diseases, like those of the whole body, are to be cured by an application of stimulant powers, in a degree proportioned to the state of the excitability.
Diseases of accumulation, in their various degrees. | 40 or Death | Degrees of stimulus to be applied, to produce the greatest possible excitement. |
39 — 1 | ||
38 — 2 | ||
37 — 3 | ||
36 — 4 | ||
35 — 5 | ||
34 — 6 | ||
33 — 7 | ||
32 — 8 | ||
31 — 9 | ||
30 — 10 | ||
29 — 11 | ||
28 — 12 | ||
27 — 13 | ||
26 — 14 | ||
25 — 15 | ||
Small degrees of accumulation, not constituting what is commonly called disease. | 24 — 16 | Appropriate degrees of stimulus. |
23 — 17 | ||
22 — 18 | ||
21 — 19 | ||
Middle state of the excitability. | 20 —20 | Appropriate degrees of stimulus, producing healthy excitement. |
Small degrees of exhaustion, not constituting what is commonly called disease. | 19 — 21 | Appropriate degrees of stimulus. |
18 — 22 | ||
17 — 23 | ||
16 — 24 | ||
Diseases of exhaustion, in their various degrees. | 15 — 25 | Degrees of stimulus to be applied, to produce the greatest possible excitement. |
14 — 26 | ||
13 — 27 | ||
12 — 28 | ||
11 — 29 | ||
10 — 30 | ||
9 — 31 | ||
8 — 32 | ||
7 — 33 | ||
6 — 34 | ||
5 — 35 | ||
4 — 36 | ||
3 — 37 | ||
2 — 38 | ||
1 — 39 | ||
0 or Death. |
☞ EXPLANATION of the TABLE.
THIS Table is meant merely to convey a general idea of the manner, in which stimuli should be increased, or diminished, in proportion to the exhaustion, or accumulation of the excitability. It is not supposed, that the degree of the excitability, or the proportion of stimulus represented by the figures in the table, can be ascertained in any other manner, than by observation of the effects produced by their application. The range of figures, is by no means sufficient to express the various degrees of accumulation and exhaustion of the excitability, that can take place, between the middle state and death. It will however, be sufficient to give a general idea of the mode of cure, deducible from the principles laid down in the preceding pages.