But there are certain forms of
mental disease, generally lumped under the term "insanity," which
indicate a hereditarily disordered nervous organization, and individuals
suffering from one of these diseases should certainly not be given any
chance to perpetuate their insanity to posterity. Two types of insanity
are now recognized as especially transmissible:--dementia precox, a sort
of precocious old age, in which the patient (generally young) sinks into
a lethargy from which he rarely recovers; and manic-depressive insanity,
an over-excitable condition, in which there are occasional very erratic
motor discharges, alternating with periods of depression. Constitutional
psychopathic inferiority, which means a lack of emotional adaptability,
usually shows in the family history. The common type of insanity which
is characterized by mild hallucinations is of less concern from a
eugenic point of view.
In general, the insane are more adequately restricted than any other
dysgenic class in the community; not because the community recognizes
the disadvantage of letting them reproduce their kind, but because there
is a general fear of them, which leads to their strict segregation; and
because an insane person is not considered legally competent to enter
into a marriage contract.
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