[1] “The Absurdity of Sickness,” by James C. Jackson, M.D.

Few people have any just conception of the prevalence of disease even in their own midst—among their own kindred; and this is simply because it never absurdly happens that all those who are subject to illnesses are “attacked” at the same time. When any large proportion are down at once, the doctors call it an epidemic, and it is attributed to a “wave”—an epizootic or influenza wave, for example, according as the victims are horses or men (the poor animals depend upon the elevated race for their habits, and never have disease except these are unphysiological),—when, in fact, the so-called epidemic, whether it be

scarlet or yellow fever, diphtheria, or what not, is the result chiefly of the uniformly bad living habits of our people and their consequent predisposition to sickness. I do not ignore the influence of contagion in certain disorders, but assert that no person in prime physical condition is ever made sick by transient contact with the so-called contagious diseases.

“There can be no doubt,” says Dr. Moore, “of the inherent effort of the system to preserve its integrity and to resist and overcome the effects of morbid influences. And when the system is properly organized and perfect in its physiological functions, it has the power to accomplish this (unless these obnoxious influences are so overwhelming as to destroy life at once) in a prompt and complete manner, unaided by any external influences whatsoever, so that health will be maintained and all injurious action of disease-producing causes unconsciously and successfully averted. But if instead of such a properly organized and healthy system, we have formed an incomplete and inferior grade of structural organization, and consequently an enervated nervous system, resulting from imperfect and deficient nutrition, such as evidently exists in the scorbutic diathesis (the effect of deficiency in vegetable food), or as must result from habitual or frequent digestive disturbances, this endeavor to resist or avert disease, will be necessarily so enfeebled that it will be impossible for the system, by its own inherent and unaided energy, either to ward off or to overcome the effects of disease-producing agents. This protective and restorative effort,

if not sustained by a high character of structural organization and active nervous energy, must be followed, therefore, as a natural consequence, by an exhaustion of vital power; in which condition there would be evidently an increased susceptibility to all morbific influences, and a marked predisposition to any exciting causes of disease which might be brought to bear upon it.

“It is well known that certain individuals are more severely affected by any ascertained cause of disease than others; and also that the same exciting cause may at one time produce serious disturbance of health, while at another, and under precisely the same conditions, as far as known, no injurious effect is produced. How frequently do we observe during the same epidemic, as, for instance, scarlet fever, measles, diphtheria (and even of sporadic forms of disease), a marked difference in the character and severity of individual cases. Even in members of the same family, under apparently similar conditions, some are stricken down with the most malignant form of one of these diseases, while others may, at the same time, be but slightly affected by it, or perhaps entirely escape an attack. It can not be that they who are the most severely affected receive a larger or a stronger dose of the morbific agent which has produced the disorder, than the others, and that the disease-producing influence, in consequence of larger quantity or greater strength and power, acts with more severity and force on one than on another. For, leaving out of consideration all effects of existing

predisposition, we know that a person unprotected by a previous attack or by vaccination, would be, in all probability, just as severely affected by the contagious influence of a case of small-pox, whether he was exposed for a few moments or for several hours; and besides, it would make no difference whether the case happened to be a mild one or of a more malignant form.

“It is, therefore, difficult to account for this variable operation of disease-producing agents, unless we admit the existence of such a latent predisposition as that already mentioned, and acknowledge that the system, at the time of exposure to disease-producing causes, is thereby made more or less susceptible to their effects in proportion to the development of such a predisposition. The less the power of resistance and the greater the degree of impressibility, the more aggravated will be the character of every disease which affect the system while it is thus predisposed; or, in other words, the severity of the disease will be proportionate to the degree of departure from the standard of health.”[2]

[2] “Predisposition and Typhoid Tendency,” by Thomas Moore, M.D. Philadelphia.

Predisposition is that state of susceptibility produced by the continued operation of the predisposing cause. Exciting causes are those which tend to the immediate development of diseases, especially in a system already having a predisposition thereto.