. The mental affections of children : idiocy, imbecility and insanity. still much to do. In genetous idiocy,abnormalities in the form of the encephalon are often visibleto the naked eye. The most common are: the convolutionsare coarse and simple, with few secondary folds, or the gyriare small, slender, and curling (microgyry*). Sometimes afew convolutions, especially in the upper parts of the frontaland parietal lobes, are notably narrower than the rest. Thereare at the same time alterations in the amount and in thearrangement of the underlying white substance. Heschl,Chiari, and Jelgersma-f c
. The mental affections of children : idiocy, imbecility and insanity. still much to do. In genetous idiocy,abnormalities in the form of the encephalon are often visibleto the naked eye. The most common are: the convolutionsare coarse and simple, with few secondary folds, or the gyriare small, slender, and curling (microgyry*). Sometimes afew convolutions, especially in the upper parts of the frontaland parietal lobes, are notably narrower than the rest. Thereare at the same time alterations in the amount and in thearrangement of the underlying white substance. Heschl,Chiari, and Jelgersma-f consider the microgyry may becaused by a deficient growth of the white substance ; appar-ently a wide surface is required for the functional power ofthe enveloping cortex. This is gained by throwing it * See Casuistische Beitrage zur Kenntniss der Microgyrie, von Dr R. Otto,Archiv filr Psychiatric, Band xxiii, p. 153- t Das Gehirn ohne Balken, von G. Jelgersma. Neurologisches Cntt>-a/t/a/t,No.(>,1S90. PLATE VII. * ^^taJ^i_i_ 3 ~ €2^^P* ^^ Pio. I. VIII.
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