. A treatise on mental diseases. lace we soon have not only stoppage of intellectualdevelopment, but, in many instances, retrogression from former at-tainments, while at the same time there remains no possibility inlater life of the correlation of association tracts. The acute encephalitis of Striimpell, the analogue of the spinalinfantile paralysis of childhood, is a factor of comparative infre-quency in idiocy. It is not to be denied that such a condition issometimes noted, but it is clinically indistinguishable from the morefrequent occlusion of the cerebral arteries. All these several morb
. A treatise on mental diseases. lace we soon have not only stoppage of intellectualdevelopment, but, in many instances, retrogression from former at-tainments, while at the same time there remains no possibility inlater life of the correlation of association tracts. The acute encephalitis of Striimpell, the analogue of the spinalinfantile paralysis of childhood, is a factor of comparative infre-quency in idiocy. It is not to be denied that such a condition issometimes noted, but it is clinically indistinguishable from the morefrequent occlusion of the cerebral arteries. All these several morbid processes tend to the formation of thecystic and other degenerations of the brain substance, with depres-sion and imperfect development of the convolutions. Very smalldefects are occasionally met with, as in the accompanying figure,where an irregular opening, 3x3 centimetres in its greatest diame-ters, beneath the base of the second frontal convolution, was foundin a young man physically well developed, but whose mental aver-. Fig. 37.—False Porencephalia. The person from whom this specimen was obtained wasa medium-grade Imbecile who had lived to reach the age of fifty-eight years, lie wastall, with fairly well-developed musculature, and without marked cranial the autopsy the brain weighed 950 grammes. The convolutions on the externalaspect of the hemispheres were without marked asymmetries, but the right half of thebrain was considerably smaller than the left, and when taken out of the bony envelopeflattened perceptibly. On closer examination a defect was found on the median-infe-rior aspect of this hemisphere, measuring 4 centimetres in its greatest length by 2 inits greatest width. The anterior margin lay considerably forward of the spleniumof the corpus eallosum; the posterior end stopped 3}-^ centimetres before the tip ofthe occipital lobe. The defect was separated from the ventricle by a leathery substance,from to millimetres in thickness. This
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