heredity, in two others the father was intemperate and in two more
causes acting after birth are mentioned.

The statistics of the insane and idiotic in Prussia presented by Mayet
clearly indicate the large part which heredity plays in the production
of mental disorders. Tables XX and XXI set forth the most important
results of his work. Mayet considers a case hereditary if any near
relative of the subject suffered from mental or nervous disorder, or
was intemperate, suicidal, criminal or eccentric.[72]

[Footnote 72: Mayet, _Verwandtenehe and Statistik_, quoted by Feer,
_Der Einfluss der Blutsverwandschaft der Eltern auf die Kinder_, p.
13.]

TABLE XX.
--------------------------------------------------
| No. of |Percentage
| Cases. |hereditary.
--------------------------------------------------
1. Simple Insanity |102,097 | 31.7 = 100
Consanguineous parentage | 664 | 69.0 = 218
Parents cousins | 595 | 68.1 = 215
Parents uncle and niece | 66 | 77.3 = 244
--------------------------------------------------
2. Paralytic Insanity | 22,936 | 17.6 = 100
Consanguineous parentage | 95 | 45.3 = 257
Parents cousins | 87 | 44.8 = 255
Parents uncle and niece | 8 | 75.0 = 426
--------------------------------------------------
3. Epileptic Insanity | 14,067 | 25.6 = 100