STUDY OF BHAIXS OF STX EMINENT SCIENTISTS AND SCHOLARS. 2 ( U 



world's thought along. His face reflected his character. His square and prominent 



forehead suggested his vigorous intellect and marvelous memory ; his brilliant eyes 



were the media of exceptional keenness of observation ; his prominent chin was in 



traditional harmony with his aggressive spirit. 



(Compiled from biography of H. F. Osborn; Science, May 7, 1897, and Centurij 



Magazine, November, 1897.) 



The Brain. 



The weight uf the fresh encephalon, with the pia-arachnoid still attached, was 

 54.5 ounces, equivalent to 1545 grammes, a weight which exceeds that of the average 

 male brains of whites by about 150 grammes. (See Table I.) After immersion in an 

 alcohol-formal mixture, and after removal of the pia, the weight of the encephalic 

 parts was as follows : 



Left hemicerebrum ......... 47-5.8 



Right hemicerebrum ......... 448.9 



Cerebellum, pons and oblongata ...... 153.5 



Total 1078.2 



The loss in weight amounts to 467 grammes, or 30 per cent, of the original weight. 



The Cerebrum. 

 In general, the cerebrum presents a fairly complex development, with intricate 

 fissuration and a bold contour of the numerous gyi'es. Viewed dorsally, its great 

 breadth (cerebral index 81.8) is readily noted, as also the relatively greater fullness of 

 the left hemicerebrum in the region of the fronto-parietal operculum and the adjacent 

 parts. Of the frontal lobes, the left seems the more complexly and deeply fissured, as 

 well as the more massive. Viewed laterally, and comparing the two sides, the pre- 

 operculum is better developed and more massive on the left side, as is also the region 

 about the left marginal and angular gyres. The right super-parietal region, however, 

 is more massive than on the left side, though, if we compare this brain with some 

 others of eminent men, Gylden's for example, this portion of the cerebrum is not par- 

 ticularly large in its development. In the ventral view, the right temporal lobe is 

 slightly longer and of more slender contour than the left, which is considerably 

 broader and thicker. The fissuration is also more marked on the left side. The 

 greater breadth of the orbital surface of the left half is quite apparent. On the whole 

 it may be said that there is a slight preponderance in the size and in the degree of fis- 

 suration of the left as compared with the right half The horizontal semi-circum- 

 ference on the left side, measuring between the hemicerebral poles, exceeds that of the 

 right side by 1 cm.; these measures are, respectively, 23 and 22 cm. 



A. p. S.— XXI. KK. .5, 11, '07. 



