Page:Natural History Review (1861).djvu/89

Rh be regretted that so inadequate a figure should have been taken as a typical representation of the Chimpanzee's brain.

3. The Hippocampus minor.—But even supposing that the posterior cornu of the lateral ventricle and its appendage, the hippocampus minor, were absent in the apes, and "peculiar to the genus Homo," what classificatory value would the distinction possess? This, of course, depends upon the constancy of the supposed distinctive character; but it so happens that, as every anatomist knows, the posterior cornu and the hippocampus minor, are precisely those structures which are most variable in the human brain. This is by no means a novel discovery. The work of the brothers Wenzel has now been published nearly half a century, and it contains (pp. 144–146) the following account of the special researches of these observers on the posterior cornu and the hippocampus, which they call simply "Tuber":—