250 



STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 



is interrupted by the junction of the subeentral with the central and the other neigh- 

 boring fissures and their rami help to make the gyre quite a tortuous one. The 

 parietal gyre is of complex appearance but not particularly large. The unusual shape 

 of the paroccipital has been alluded to above. It should here be noted however that 

 the most striking feature is that the caudal arm (/. e., the postoccipital portion) of the 

 paroccipital gyre is tenfold greater in area than the cephalic area. Its great width 

 has caused the marked lateral deviation of the paroccipital fissure as it passes caudad, 



Fig. 22. Mesal aspects of the cerebral halves of Joseph Leidy. The cuneus and precuneus are shaded. The upper 

 figure shows the mesal aspect of the right halt ; the lower figurt^ shows the left half. 



and this feature is perhaps of not a little significance in relation to Leidy's observa- 

 tional powers. Whatever psycho-physical interpretation may attach to the redun- 

 dancy of this part of the paroccipital, it cannot be denied that it is an expression of 

 the highest development of the premiere pli de passage externe of the anthropoids. 



The marginal and angular gyral districts present very interesting features. The 



