228 



BRAIN-WEIGHT AND SIZE IN RELATION 



testing the process fully confirmed the results stated by Professor 

 Wyman as to the differences in apparent cubical capacity according 

 to the material employed. Taking a sound Huron Indian skull, a 

 mean internal capacity of 1490 grms. was obtained by repeatedly 

 gauging it with peas, and of 1439-5 with rice. The position of the 

 Negro, heading the list, serve to show the exceptional nature of the 

 evidence ; though this is rather due to the inferiority of other exam- 

 ples, such as the Chinese and Greenlander, than to its greatly 

 exceeding the Negro mean. In the first column the unzen, as Prus- 

 sian ounces, are rendered in grammes. The second column gives the 

 nearer approximation to the true specific gravity, according to the 

 standard referred to, based on a series of experiments undertaken for 

 me by Professor Croft, and assuming 82-5 grms. of peas to occupy 

 the space of 100 grms. of water. The third and fourth columns 

 represent the estimated brain- weight, after the requisite deductions,, 

 on the basis of s.g. of brain as 1-0408. • 



TABLE VIII. 



COMPAEATrVE CAPACITY OF RACBS : LUCAE. 



In the following table the examples are derived from Dr. J. B. 

 Davis's tables, with the exception of the Peruvians. For these I 

 have availed myself of Dr. Jeffreys Wy man's careful observations 

 on the large collection in the Peabody Museum, the results of which 

 confirm Dr. Morton's earlier data. One further fact, however, may 

 be noted as a result of my own study of Peruvian crania, amply con- 

 firmed by the published observations of others, viz., that while the 

 Peruvian head unquestionably ranks among those of the microce- 

 phalous races, the range of variation among the Coast tribes appears 

 to be less than that even of the Australian. Of this there is good 

 evidence, based on the comparison of several hundred crania. But 



