CEREBRAL CONVOLUTIONS — " SALLY." 51 



and Muller's specimens were quite young, and no particular 

 intelligence has been attributed to them. The only sugges- 

 tion remaining is that in the species T. calvus the brain does 

 present peculiarities, and that Broca's and Muller's specimens 

 belonged also to this species. 



On the other hand, we are still uncertain that there is more 

 than one " species " of chimpanzee. Mr. Beddard, from a 

 careful study of the muscular anatomy of " Sally's " limbs, from 

 a comparison of the skull, brain, and other organs, considers 

 that the animal belonged to the species T. calvus, and shows 

 reasons for distinguishing it from the animal described, ana- 

 tomically, by Gratiolet and Alix, and named T. aubryi. 

 Nevertheless, the differences in muscular anatomy, &c., re- 

 corded in the ordinary chimpanzee and in these two other 

 forms, can scarcely be held to establish with absolute certainty 

 the specific distinctness of these three forms ; the variations in 

 muscular anatomy in man appear to be every bit as great as in 

 these, and till sufficient specimens of the black- faced bald 

 chimpanzee, known as T. calvus, on the one hand, and of the 

 flesh-coloured, black-red haired form (T. niger), have been as 

 fully and as carefully described as Beddard has done for 

 '' Sally/' we shall not be entitled — at least we ought to 

 hesitate — to be positive about the " specific " differences of 

 these three forms. 



As we shall see, the convolutions of the chimpanzee's brain 

 are subject to variations as wide as occur in man, and some of 

 them are of importance. Such features, too, as the shape of 

 the ear are extremely variable, every stage in the folding of 

 the margin being exhibited, from the unfolded condition to a 

 state closely resembling man's ear. 



For the present, at least in this paper, the chimpanzee 

 " Sally" is regarded as being merely a " variety '^ of the single 

 species T. niger. 



3. Description of " Sally's '^ Brain. ^ 



The general features, dimensions, and weight of " Sally's " 

 brain have been described by Beddard ; 1 have but little to 



