152 Journal of Comparative Neurology and Psychology. 



The figures themselves, for which the original article must be 

 consulted, are certainly far from convincing, the pathological material 

 especially showing some glaring con traditions; for instance, the differ- 

 ence in the two analyses of neurasthenia and senile dementia. Furth- 

 ermore, the figures on the percentage of water in general paralysis, 

 are not as high as the marked pial oedema of this disease would lead 

 us to believe. 



Thudichum's figures are the result of the working over of a large 

 amount of material and of complex elaborated methods. For the gray 

 matter of the human brain he gives the following results : 



Ether extract (kephalin, lecithin and cholesterin) 1 1 .497 

 Cerebroside and myelin 6.910 



Lactic acid 0.0456 



Inosite 0.2171 



Alkalies (as carbonates) 0.1717 



The following figures were established for the entire human brain, 

 as the sum of results from separate analyses of the two hemispheres, 

 cerebellum, mid-brain and medulla, gray and white matter. The fig- 

 ures are given in grammes, and relate to the entire weight of the brain 

 without membranes (1296 grammes). 



