CHAP. XX.] 



OF THE HUMAN BRAIN. 



853 



CRANIAL CAPACITY IN DIFFERENT HUMAN RACES. 



The same writer adds :* " The cranial capacity of the 

 Gorilla often reaches 600 cubic centimetres, so that it 

 follows that there are a large number of men more allied 

 by volume of brain to the anthropoid apes than they are 

 to some other men." 



Brain-Weights. 



The mode of weighing the Brain has not always been 

 similar by different observers. Some have been accus- 

 tomed to strip off its thin enveloping membranes before 

 putting the organ into the scales, while others weigh it 

 and them together. But the weight of ' arachnoid ' and 

 ' pia mater ' is pretty well known, and would scarcely 

 exceed | or 1 oz. Again, of those who follow the latter 

 and by far the most common method, some have weighed 

 the brain in its entire condition almost as soon as it has 

 been removed from the body ; while one observer at least, 

 Dr. Thurnam, has been in the habit of slicing it first and 

 allowing serum and blood to drain away for one to two 



* Loc. cit, p. 75. 



A A 



