AN AMERICAN INDIAN BRAIN 415 



and Keegan, '15). No single morphological point could be 

 selected which would represent inferiority. AVhile in the Negro 

 the mental characteristics may be in part explained by the 

 great predominance of the parietal lobe over the frontal lobe, 

 in this brain the characteristic feature is not a disproportionate 

 growth of any large area, nor any striking complexity or sim- 

 plicity of fissuration, but a marked asymmetrv' of the fissures 

 and convolutions. 



COXCLUSIOXS 



1. This Indian bruin represents in practically all features a 

 high type of cerebrum, the only possible exceptions being the 

 shallow communication of the incisura rhinalis with the sulcus 

 collateralis and the presence of a typical sulcus lunatus in the 

 left hemisphere. 



2. The great asymmetry' of the two hemispheres in fissuration 

 is the most convincing evidence of a highly specialized cerebnun. 

 Future combination of physiological observation with cerebral 

 morphology will undoubtedly lead to a better interpretation of 

 such variations. 



3. The comparison of cerebra of different hidivitluals should 

 take into consideration tins relation of asymmetrj' to functional 

 localization and should be confined to hemispheres of the same 

 side in individuals of as near similar mental traits as possible. 



4. The method of plotting the cortical areas estabUshed by 

 E. Smith, although inaccurate in many details, aids greatly in 

 the interpretation of fissures and m the comparison of the de- 

 velopment of different areas. It serves as the most expressive 

 manner in which the morphologA' of cerebra can be presented 

 for comparison. 



LITERATURE CITED 



Appleton, a. B. 1911 Descriptions of two brains of natives of India. Jour. 



Anat. and Physiol., vol. 45. 

 Brodm.\nn, K. 1907 Beitriige zur histologischen Lokalization der Grosshirn- 



rinde. Journ. fiir Psychol, und Neurol., Bd. 6. 

 Campbell, A. W. 1905 Histological studies on the localization of cerebral 



function. Cambridge. 

 Cole, S. J. 1910 On some morphological aspects of microcephalic idiocy. 



Jour. Anat. and Physiol., vol. 44. 



1911 Remarks on some points in the fissuration of the cerebrum. 



Jour. Anat. and Phvsiol., vol. 46. 



