1880.] NATURAL SCIENCES OF PHILADELPHIA. 113 



monkeys, for there is no necessit}' of having recourse to such 

 measures to prove that the cerebellum is covered in the latter? 



In the account I gave of the female Chimpanzee,' I stated that 

 I found the cerebellum uncovered. I had the opportunit}^ a short 

 time since, of verifjnng that statement in the male, noticing in 

 '^itu that the cerebellum was uncovered b}^ the posterior lobes. 

 This was found to be the case b^^ Mr. Arthur Browne, the Super- 

 intendent of the Phila. Zool. Garden, in a third Chimpanzee 

 which died there. With all deference to Prof Marshall's ^ photo- 

 graph of a plaster cast of the brain of a Chimpanzee, and how- 

 ever it may truthfully represent the relations of the cerebellum in 

 his specimen, I must say that it would be simply monstrous if 

 accepted as an illustration of either of mine, and with profound 

 respect for Prof. Huxley's^ opinion regarding the interior of the 

 skull being a guide for the determination of the proportion between 

 posterior lobe and cerebellum, I find it an3'thing but a safe one as 

 regards the anthropoid apes. For the space between posterior lobes 

 of brain and dura mater and bone, both posteriorly and laterally, I 

 find very variable in situ, due to the state of the blood vessels and 

 amount of fluid in arachnoid and subarachnoid cnvities. In speak- 

 ing of the Gorilla, Prof. Bischotf ^ observes, p. 100, " Das es bei 

 ersterem am wenigsten von oben Hinterlappen der grossen Hemi- 

 sphiire bedecktwird und bei der Betrachtung des Schiidel gewiss von 

 oben mit seinem hinterern Rande sichtbar wird." And in reference 

 to the Chimpanzee,^ p. 95, " Die Hinterhauptslappen des grossen 

 Gehirns bei diesem Affen wie bei dem Menschen das kleine Gehirn 

 iiberzogen und von oben fast ganz bedecken."' And Vrolik" states, 

 p. Y, of the Orang : " Ce lobe posterieur ne se prolonge pas autant 

 que chez I'homme ; il ne recourve pas si bien le cervelet du moins il 

 ne cache pas completement surtout vers les cotes." The fact of the 

 cerebellum being covered by the posterior lobes in my Orang and 

 that figured b}- Gratiolet, and but slightly uncovered in that of 

 Vrolik's, is no more strange than that Bischoff"^ should find it 

 covered in one Hylobates, and Prof. Huxle}' ** having stated it to 

 be uncovered in another. 



I did not observe anything particularly noticeable about the 



1 Proceed, of Acad., 1879. ^ Natural History Review, 1861. 



^ Man's place in Nature, p. 97. * Das Gehirn des Gorillas, 1877. 



^ Gehirn des Chimpanzee, 1871. " Amsterdam Verslagen, Deel 13, 1862. 



' Beitrage zur Hylobates, 1870. ^ Vertebrate Anatomy, p. 411. 



