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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...regards. ACCOUNT OP A CASE IN WHICH THE CORPUS CALLOSUM AND FORNIX WERE IMPERFECTLY FORMED SEPTUM LUCIDUM AND COMMISSURA WERE ABSENT. 'Trans. of Roy. Med. and Chir. Soc., ' 1861. The medical literature of examples of defective commissures of the brain comprises so few cases, and of these the life-history is so imperfect, that I need no apology in placing the records of another before the members of this Society. The question has often been proposed to me, what relation idiocy bears to these arrests of development. At an early stage of my inquiry into the pathology of idiocy, I was prepared to meet with many cases characterised by the heading of this paper, but on further investigation found that, with the exception of deficient commissura mollis, absence or defect of the larger commissures of the brain occurred but seldom. Among fifty brains of idiots which I have dissected, the following is the only example of this nature. That idiocy frequently depends on defective commissural connection my present experience does not support; but, on the other hand, that the absence of such connection may not occasionally be a cause of this calamity is, I apprehend, a question sub judice. Mr. Paget, in the twenty-ninth volume of your Transactions, ' has so ably generalised on the cases at that time on record, that there is little to be done beyond adding to the facts illustrating this interesting subject. The case to which I beg leave to call your attention, is that of A. B--, a boy aged nine years at the time of his death. He had previously been under my daily observation for two and a half years. He was the first-born of three children; the second, a boy, is also idiotic; while the third and youngest, a girl, is healthy and intelligent. The respective ages of his father ...

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