212 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



nearly alike); the cerebellum shows the prevalence of a greater length 

 of the left lobe (in some whites and Indians right lobe); and the length 

 of the hindbrain is relatively more considerable in the Indian than in 

 the white or negro (in whom it is nearly alike). 



Finally, as to brain dill'erences in the principal forms of the skull, it 

 was found that the relative length of the frontal lobes is somewhat 

 smaller in the dolicho- than in the brachycephals; the relative length of 

 the parietal lobes is throughout smaller in the dolicho- than in the 

 brachycephals; the relative length of the occipital portions of the 

 cerebrum is on the whole larger in the dolichocephals (see indexes of 

 the fossie and comparison of the length of the postero-superior fossa 

 with that of the anterior and middle cavities); finally, in the cerebellar 

 length, the dolichocephals show more difference on the two sides than 

 the brachycephals, but the brachycephals show throughout a greater 

 relative length of the hindbrain than the dolichocephals. 



On the basis of this study the following characteristics of the adult 

 human skull or brain may be viewed as of lower developmental order: 

 A large relative length of the frontal fossae, or frontal lobes (infantile 

 and animal feature); a small relative length of the middle fossa% or 

 parietal lobes (infantile feature); a small relative length of the cerebral 

 part of the posterior fossa, or the portion of the cerebrum it contains 

 (infantile and animal feature), and a smaller relative length of the 

 cerebellar. fossa, or the cerebellum (infantile and animal feature). 



Looking, at the series of examined skulls in this light, the male 

 skulls show a little more favorablj' than the female; racially we are 

 confronted with the curious and most unexpected fact of the quite 

 close position of the whites and negro males and a more advanced 

 differentiation of the Indian over both, while as to cranial typos the 

 dolichocephals show some developmental superiority in the frontal and 

 postero-superior fossae and corresponding lobes, the brachycephals in 

 the middle fossse, or lobes, and in the relative length of the whole 

 cerebrum. 



Much larger series of specimens would very likely accentuate many, 

 and probably modify a few, of the results obtained with tlie numbers 

 available to the writer. It is to be hoped further opportunities in this 

 respect will arise and be utilized here or elsewhere with other investi- 

 gations in the future. Measurements on the brain itself could, per- 

 haps, take to some extent the place of those on the fossae, though 

 more confidence must remain with the latter, which are not subject to 

 deformation. 



