

1879.] NATURAL SCIENCES OF PHILADELPHIA. 59 



within the cranial chamber," I did so, and yet the cerebellum re- 

 mained uncovered. Is it possible that in my young female Chim- 

 panzee the posterior lobe had not attained its full growth, or that 

 in some Chimpanzees the posterior lobe covers the cerebellum, 

 and in others it does not ? According to Prof. Huxley, this is 

 the case among the Gibbons, for in referring to the Siamang, he 

 says: this 1 " is remarkable, for the short posterior lobes of the 

 cerebrum which in this anthropomorphous ape do not overlap 

 the cerebellum, as they do in all the others." On the other hand, 

 Prof. Bischoff observes in his Beitrage on the Hylobates, " Da- 

 gegen kann ich Flower unci Huxley darin nicht beistimmen das 

 ,die hinteren Lappen des grossen Gehirns eine sehr bemerkens- 

 werthe Reduction gegen die der Gehirne der anderen Anthro- 

 poiden darin zeigen, dass sie das kleine Gehirn nicht mehr vbllig 

 bedeckten. Bei meinem Hylobates ist das kleine Gehirn vollstand- 

 iug durch die Hinterlappen des grossen Gehirns bedeckt." 2 It 

 appears to me more likely that in some Gibbons the cerebellum 

 is covered, and in others not, than that such eminent anatomists 

 as Professors Huxley, Flower, and Bischoff should be opposed in 

 reference to a mere matter of observation, and so with regard to 

 the diversity of opinion as to the cerebellum being covered by 

 the posterior lobes of the cerebrum in the Chimpanzee. 



According to Huxley, Rolleston, Marshall, Gratiolet, etc., the 

 cerebellum is covered by the cerebrum in the Chimpanzee. 



In the figures of the Chimpanzee given by Tyson, Tiedemann, 

 Yrolik, Schroeder Van der Kolk and Vrolik, the cerebellum is un- 

 covered by the posterior lobes of the cerebrum. Tiedemann 

 says: " The hemispheres of the brain are relatively to the spinal 

 marrow, medulla, cerebellum, etc., smaller than in man." 3 Ac- 

 cording to Vrolik, the Chimpanzee brain is distinguished from 

 the human, "par un moindre developpement des hemispheres du 

 cerveau qui ne recouvrent tout le cervelet."* Gratiolet, in refer- 

 ring to the figures of the brain of the Chimpanzee, in Schroeder 

 Van der Kolk's and Vrolik's paper in the Amsterdam Verhandelin- 

 gen for 1849, speaks of the brain as being " profondement aflaise." 

 Now, while these eminent anatomists admit the justness of Grati- 



1 Anatomy of Vertebrates, p. 410. 



2 Beitrage, etc., Munich Aband, 1870, p. 272. 



3 Philos. Trans., p. 518. 

 i Recherches, p. 39. 



