The general public is rapidly coming to realize that our public dependents are largely recruited from the defective classes, and that but comparatively few persons become a public charge as the result of disease or adversity.
Neurologists recognize a so-called predisposition to insanity, which in fact is an inherited defect, or perhaps, more correctly speaking, defects, as there are usually several defective conditions in the mental and nervous organization, and frequently very pronounced physical stigmata.
Sanger Brown says, in speaking of this predispositiou, that the phenomena which this condition presents may be readily accounted for by assuming a defect or defects in the neurons (the cell units of which the nervous system is composed) of such a nature that stimuli from environment may not reach the neurons of the cortex, or, having done so, the impression made there may not be sufficiently deep and lasting
SHARP HC. VASECTOMY AS A MEANS OF PREVENTING PROCREATION IN DEFECTIVES. JAMA. 1909;LIII(23):1897–1902. doi:10.1001/jama.1909.92550230009002e
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