In 2784 defective children observed at the Bicetre and in the Fondation Vallée from 1879 to 1900, Bourneville has found only 91 cases (3.23 per cent.) in which the parents were of near kin—cousinsgerman in 49 cases, cousins farther removed in 36 cases, other or undefined relationships in 6 cases. In all the 91 cases some degree of neuropathic heredity could be traced. These figures thus confirm the view that parental consanguinity is, per se, insignificant as a cause of degeneracy in the offspring.
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