Page:Natural History Review (1861).djvu/92

80 2. In the anthropoid apes the cerebrum is smaller, relatively to the cerebellum, than in man.

3. In the anthropoid apes the sulci and gyri are generally less complex, and those of the two cerebral hemispheres are more symmetrical, than in man.

4. The hemispheres are more rounded and deeper in man than in the anthropoid apes, and the proportions of the lobes to one another are different. Furthermore, certain minor gyri and fissures, present in the one, are absent or rudimentary in the other.

The evidence of the first of these differences has, I believe, been universally admitted since the time of Sœmmering. The second and fourth clearly result from the observations of Schroeder van der Kolk and Vrolik, and those of Gratiolet (Mem. sur les plis cerebraux des Primatès, 1854), as will appear from the following extracts. The first citation is taken from the work of the first-named authors, which seems to be so little known in this country, that I make no apology for length of the extract:—