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CHAPTER III THE INHERITANCE OF MENTAL DEFECTS AND DISEASE "Our
human civilized stock is far more weakly through congenital
imperfection than that of any other species of animals, whether
wild or domestic."?Francis Galton, Inquiries into Human Faculty.
That many forms of mental deficiency and disorder are capable of
hereditary transmission, has long been recognized, but it is only
recently that attempts have been made to discover the precise rules
according to which such transmission takes place. Much, however,
still remains obscure in regard to this important topic. The vast
literature on the subject contained in works on medicine and
pathology, in numerous medical journals and various other
publications consists mainly in the discussion of isolated cases of
transmission, or the compilation of mass statistics from the
records of institutions for the care of the mentally abnormal.
Institutional records being often gathered in a more or less
perfundtory manner, and by many different persons, are apt to
include numerous inaccuracies and are pretty sure to fall short of
the desired degree of fullness. The relatives of mental defectives
from motives of family pride frequently conceal the existence of
defects in other members of the family, and even when they honestly
attempt to give all the information they possess they often fail to
furnish data of any value. It is not surprising, therefore, to
encounter wide differences of opinion among authorities concerning
the extent to which various forms of defect depend upon a
hereditary diathesis. Practically everyone whose opinion is of any
value concedes to heredity a certain role in the causation of
neuropathic traits. A part of the difference of opinion doubtless
depends upon the circumstance that the relative potency of her...
|Country of origin:
Samuel Jackson Holmes
||246 x 189 x 7mm (L x W x T)
||Paperback - Trade
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