NO. 1521. MEASUREMENTS OF CRANIAL FOSS.E—HRDLICKA. 211 



In human fetuses and youn^ in general, the rehitive length of the 

 anterior lobes is greater than that in adults; the avcu'age length of the 

 right lobe is alread}^ somewhat greater than that of the left, but indi- 

 vidually^ there are man}" more cases than in the adults in which the 

 two are equal; the length of the parietal lobes is smaller than that of 

 the frontal (a reverse condition from that found in adults); the right 

 lobe is the longer more often than the left, but in one-half of the 

 specimens they are equal; the relative length of the parietal lobes is 

 less than in adults; the relative length of the occipital lobes, or at 

 least of that on the left side, is slightly smaller than the general 

 average in adults; there is a prevalence of longer left lobe, l)ut the 

 proportion of equally long lobes is larger than among the adults; the 

 relative length of the cerebellum is somewhat smaller than in adults; 

 and the left lobe is more often the longer. 



In the anthropoid apes, monkeys, and other mammals (so far as 

 represented), the relative length of the frontal lol)es is, with a few 

 exceptions, greater than in human adults and often greater even than 

 in human young; the right lobe is probably longer in all the apes 

 except gibbons, and was found longer individually also in some of the 

 other primates and mammals (the differences being greatest in the 

 higher apes); the length of the parietal lobes is greater than that of 

 the frontal in the gorilla and orangs, and in several of the monkeys, 

 but is smaller in the gibbons, macaque, deer, and particularly in the 

 pig; the right lobe is prevalently the longer among the anthropoid 

 apes only; the relative length of the lobes is greater in anthropoid 

 apes, and especiall}" in the monkeys and other mammals, than it is in 

 adult man; the relative length of the occipital lobe is smaller in an- 

 throphoid apes than in man, and still smaller in the monkeys and 

 lemurs; in mycetes, alouata, and especially in lemur, it is shorter 

 than either the frontal or parietal lobe; the left lobe is prevalently the 

 longer in the apes and among monkeys, but was found shorter than 

 the right in midas and lemur; the relative length of the cerebellum is 

 somewhat greater than in adult man in the chimpanzee and orangs, 

 but is smaller in the gibbons and other primates with lemurs. 



Sexual differences in the brain are, so far as here dealt with, but 

 few in number and not large. Relatively the anterior lobes are slightly 

 longer in the females than in the males, and there is apparently some 

 correlated tendency in the females, especially in the negroes, to 

 smaller relative length of the parietal lobes. 



Racial brain differences indicated by the results of this study are as 

 follows: The relative length of the anterior lobes is smaller in the 

 Indians than in the whites and negroes (in whom it is nearly alike); the 

 middle lobes are relatively smaller in the female negro than in any 

 other series of human adults; the occipital portions are relatively 

 longer in the Indians than in the whites and negroes (in whom they are 



