In a paper of thirty-nine pages, Dr. Pellizzi considers the attempts which have been recently made to square the clinical symptoms of idiocy with the pathological alterations already noted. There are some forms in which during life the pathological lesions cannot be presumed or guessed; these forms he calls degenerative, genetous, evolved, or common idiocy. In other cases, there are definite symptoms indicating a precise lesion, such as infantile hemiplegia, diplegia, and other paralyses which have been well described by Tanzi. König has put the question, are idiocy and cerebroplegia not the same thing? But this Pellizzi justly thinks is going too far. We have found the congenital forms of idiocy much commoner than the acquired forms, though it need not be disputed that further research will tend to reduce the number of the former. In the cases analysed, Pellizzi found a proportion of 52 per cent. of the evolved form (evolutiva) and 32 per cent. of the pathological; the rest were doubtful. Pellizzi has most carefully studied forty selected cases, which are tabulated and analysed, having in view their physical and mental condition and their capacity for receiving education. He has found neurotic heredity in the cerebroplegic cases, though not so frequent as in cases of born idiocy. As one result, he has arrived at the conclusion that infantile spastic diplegia may be the result of the arrest of development. Besides his original investigations, which have been prosecuted with great diligence, there are two pages at the end of the article filled with references to contributions upon the pathology of idiocy in many European languages, which shows that the subject of idiocy is at present receiving considerable attention from pathologists.
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