710 [June 18, 



European than between the Chimpanzee and the Orang ; and, of 

 course, much less than between the highest and lowest Quadru- 

 manous brains. There is, however, less difference between the Bush- 

 woman and the highest Ape than between the latter and the lowest 

 Quadrumanous animal. 



7. The general results, the author thinks, justify the expectation 

 that characteristic differences of degree of cerebral development may 

 hereafter be found in the several leading races of mankind. 



The author then proceeds to describe the colour and relative pro- 

 portions of the grey and white substance, the commissures, ventricles, 

 and ganglionic masses. 



The commissural fibres of the corpus callosum are very deficient 

 in the Bushwoman ; and the other commissures are also small. The 

 body and anterior cornu of the lateral ventricle are also small ; but 

 the posterior cornu and its contained parts are very large. 



In the cerebellum, the median parts appear to be somewhat less 

 developed than the hemispheres. Its transverse commissural fibres 

 are more largely developed than the same system of fibres in the 

 European brain ; the Chimpanzee standing, in this respect, still lower. 

 The laminae of the cerebellum are even more numerous than in the 

 European specimen with which the Bushwoman's brain was com- 

 pared. The cerebellum seems to be more perfectly developed than 

 the cerebrum. 



2. The Idiots' brains. 



Some account is first given of the age, height, and bodily and 

 mental condition of these idiots, one of whom was a woman, aged 

 forty-two years, and the other a boy of twelve. The former was 

 able to walk, though badly, to nurse a doll, and to say a few words ; 

 whilst the latter could not walk, nor handle anything, nor articulate 

 a single word. 



In the idiot woman, the weight of the recent encephalon was 

 10 oz. 5 grs., of which the cerebrum weighed 7*6 oz., the cerebellum 

 1*95 oz., and the pons with the medulla oblongata '42 oz. In the 

 idiot boy, the recent encephalon weighed 8' 5 oz., the cerebrum 

 5*85 oz., the cerebellum 2*25 oz., and the pons with the medulla 

 oblongata *4 oz. These are the two smallest idiots' brains the 

 weights of which have been recorded. 



Calculations are then entered upon by the author to show the pro- 



