II. 



ON THE AFFINITIES AND DIFFEEENCES BE- 

 TWEEN THE BEAIN OF MAN AND THE 

 BEAINS OF CERTAIN ANIMALS. 



I have here seven drawings,, some more, some less diagram- 

 matical, in illustration of my subject, — 'The Affinities and Differ- 

 ences between the Brain of Man and the Brains of certain of the 

 Lower Animals.' The two figures on the sheet numbered I. 

 represent dissections of the brain of the dog {Canis familiaris) and 

 of the brain of a monkey, the vervet (Cercopithecus lalandii) ; the 

 brain of the monkey is to the left, that of the dog to the right in 

 the drawing. Sheet II represents similarly prepared dissections 

 of the brain of man and of the brain of an American marmoset 

 monkey (Hapale joenicillata), holding the same relative positions as 

 the preceding. These four drawings are intended to illustrate the 

 structures known as the lateral ventricles, and to show, further, 

 what relations of overlapping or of outcropping the lesser, after 

 brain, or cerebellum, may stand in to the upper and larger brain, 

 known as the cerebral hemisphere. They are drawings of dissec- 

 tions made within the last fortnight at the Oxford Museum. The 

 other eight figures are either exact reproductions of figures given 

 in M. Gratiolet's celebrated and authoritative work on the Cere- 

 bral Convolutions 1 ; or as in the single case of Sheet III, they are 

 the result of the application to his uncoloured plates of the plan of 

 colouring which Cuvier was wont to employ, and of which M. Gra- 

 tiolet has himself made such excellent use. The object of these 

 eight figures is to make intelligible what in former days was, in 

 no exaggerated metaphor, spoken of as the ' chaos of the convo- 

 lutions,' and to enable us hereby to take a scientific estimate of 



1 Paris, 1854, Bertrand, Editeur. 



