OEEEBEAL CONVOLUTIONS — " SALLY." 77 



not successful in this — and as so great an authority as Dr. 

 Cunningham has confessed his inability to thoroughly establish 

 his identifications I feel some hesitation in believing that I 

 should be more successful — I shall at any rate have added 

 new facts to the comparatively small amount of knowledge that 

 we possess concerning the oranges brain. 



Of the two orangs' brains one is historicalj being that de- 

 scribed and figured by RoUeston in 1861 (2). It is very well 

 preserved. 



The other brain, however, is rather soft and slightly injured 

 on the right side. It is, further, rather distorted, tlie hemi- 

 spheres being pressed over to the left side, so that nearly all 

 the temporo-spheuoidal lobe is thrust under the lower surface, 

 against which it is flattened. It appears to have belonged to 

 a young individual, as it is not nearly so large as those hitherto 

 figured. The cerebral hemispheres measure 84 mm. in length, 

 but it is useless to give other measurements owing to the 

 distortion of the brain. 



This brain will be referred to as Brain No. 1, that described 

 by Rollestou as No. 2. 



Orang's Brain No. 1 (figs. 43 — 45). 



The Frontal Lobes. — On the left side (figs. 42 and 44) the 

 s. prsecentralis inferior {p. c. i.) is continuous above with an 

 obliquely placed fissure, directed upwards and forwards (/«.), 

 which I would identify as the ramus horizontals, since the poste- 

 rior end of the s. frontalis medius lies below the anterior end of 

 it. About midway along its length, the s. praec. inferior gives 

 off an anteriorly directed furrow, which I would identify as a 

 part of the s. frontalis secundus (/^.). Such an arrangement I 

 have described above in a chimpanzee (fig. 38) ; and which, 

 moreover, is very similar to that figured by Cunningham for an 

 adult man on p. 262 of his memoir. 



The s. prsecentralis superior {p, c. s.) seems to be in two 

 portions, the lower of which, lying parallel to the ramus hori- 

 zontalis, is continuous with the s. frontalis primus [P.), which 

 in this hemisphere is represented by only this one fissure. 



