Insanity: Its Causes and Prevention

by Henry Putnam Stearns

Fecundity is also well known as an inherited character. A mother is referred to by Girou,[10] as having had twenty-four children, five of whom, in turn, gave birth to forty-six. A granddaughter of this woman gave birth to sixteen. The females of some families have all or nearly all daughters, who, in turn, have more daughters than sons for several generations. A grandmother had nine daughters, several of whom had no sons in the third generation.

Longevity has long been recognized as one of the most transmissible of family traits.

Cæteris paribus, persons connected with long-lived families have a much more tenacious hold on life than others: the capacity for resisting the changes of climate, the morbific conditions of the atmosphere and soil, the influences of epidemic diseases, and the experiences of privation and hardships, is greater than with other persons; and, conversely, the capacity for resisting these influences is much less with persons whose ancestors have invariably died at an early age.

So also if a person resembles in physical form, complexion, and constitution, the ancestors of one side of his family who have lived to old age, while those on the other side have died comparatively young, his prospects of longevity are generally strengthened in proportion to the extent of such resemblance. M. Levy says: “To be born of healthy and strong parents is to have a good chance of longevity; the energy of the constitution is the best buckler against the assault of destructive causes. Rush did not know an octogenarian whose family did not offer many examples of advanced old age. This observation, made by Sinclair, has acquired the force of an axiom, so common is it to meet with longevity as a frequent occurrence among many members of the same family. Inheritance exercises the same influence on the total duration of life of short period: in the Turgot family scarcely a member passed the fiftieth year; he, who rendered it illustrious, died at the age of fifty-three, in spite of the appearance of great vigor of temperament.”

So familiar to every one are the facts connected with the transmission of morbid physiological processes, that I need not refer to this point further than to remark, that the phthisical, the cancerous, and the scrofulous diatheses are those well known to be more surely inherited, and that through these channels of diseased action whole families cease to exist after two or three generations, unless the tendency is counteracted by more vigorous and healthy influences from the other parent.

Passing now to the psychological traits and characters, we observe that the same law pertains. The heredity of mental qualities is quite as persistent as that of the physical; imagination, memory, will, intellect, the sentiments and passions, may all be inherited. It is estimated that not less than forty per cent. of eminent poets have had illustrious relatives. The families of Darwin, Cuvier, Bacon, Sir Benjamin Brodie, John Adams, Lord Macaulay, Madame de Staël, present good illustrations of the inheritance of intellectual ability.

But no less surely are the characteristics of morbid mental activity transmitted from one generation to another. The records of asylums all indicate that the tendency to insanity, in some of its forms, is one of those most likely to be inherited. It is thought that more than one half of the admissions to English asylums present evidence of an inherited taint. The same is probably true in reference to admissions to asylums in the United States, though it is exceedingly difficult to arrive at the truth in all cases, inasmuch as many persons are inclined to deny that any such tendency exists in their families, lest such a fact should appear to its prejudice in some way or other.

It is not the case, however, that definite forms of insanity always repeat themselves, but, on the contrary, change, so that a case of mania may appear in the second generation as a case of melancholia, or acute dementia; and, vice versa, melancholia may appear as dementia. Information concerning the inheritance of general paralysis is not so definite; indeed, this form of insanity generally manifests itself in those having no tendency by inheritance, and would seem to be more frequent among the strong and robust, and also has a tendency to appear in the very prime of life.

It is not necessary that the tendency toward unstable mental action should be fully developed in the parent in order that it may so appear in the child. Parents who have for years been very odd or singular in their habits of life and manner of speech and mental operations; those who are subject to periods of depression, and are accustomed to look upon the dark side of daily experiences; mothers, more often, perhaps, who have all their lives been “nervous” or irritable and easily excited, impress more or less profoundly these abnormal conditions upon their offspring. Great singularity of conduct habitually displayed, periods of depression, irritableness, and nervousness, when crossed with similar characteristics in the other parent, or other unusual ones, not infrequently develop into actual insanity in succeeding generations.

A good example of such a tendency is related in the April No. of the Journal of Mental Science, 1881.[11] It began on the male side, the father being “eccentric” or “peculiar,” so much so as to attract the attention of the village children. The wife had no peculiarities of sufficient import to be marked. They had four children, three of whom were affected mentally, one female and two males. The female was “uncommon” and “slightly weak-minded.” One of the males was said to have been “weak-minded”; the other was “strange-looking,” and odd in general conduct. He married a woman in good health and free from any special tendency, either mental or physical. There were born eleven children: of these, five were imbecile; two were idiots, and the remaining four were sane. Of these four, two had one child each, one of whom died of phthisis, and the other is at present an imbecile.