THE MODIFICATION OF THE BRAIN. 



01 



':3, 21. — Lateral views of the brains of a Rabbit, a Pig-, and a Chimpanzee, drawn of noarlj 

 the same abisolute size. The Rabbit's brain is at the top ; the Pig-'s, in the middle, th« 

 <.'himpanzee*'s, lowest. — 01^ the olfactory lobe; ^., the frontal lobe; B.^ the occipital 

 lobe; C, the temporal lobe; Sy., the Sylvian fissure; /re., the insula; S.Or.^ suiira- 

 orbital ; S.F.^ M.F.^ LF.^ superior, middle, and inferior frontal gyi-i ; A.P.^ antero-pari- 

 etal ; P.P., postero-parietal gyri ; R^ sulcus of Rolando ; P.Pl^ postero-parietal lobule ; 

 O.Pf.^ external perpendicuLir or occipito-temporal sulcus; An^ an^fular cttus; 2, 3, 4^ 

 aanectont gyri; A.T., M.T.^ P.T-^ the three temporal, and S.Oc.^ M.Oc, l.Oe., the three 

 occipital gyn. 



