IV Proceedings of the Association of American Anatomists 



(1 :7.5). The cross-section area of the callosum among 10 eminent men, 

 ranging from 5.7 to 10.6 sq. cm. (Joseph Leicly) averaged 7.3 sq. cm.; 

 among the same number of ordinary men, the range was 4.7 to 6.7 sq. 

 cm., averaging 5.6 sq. cm. The significance of this redundancy in its 

 relations to the greater elaboration of brain structure as expressed by this 

 commissural system was discussed in detail but cannot be abstracted here. 

 The skull of Prof. E. D. Cope is in fairly good condition and is re- 

 markable for the proportionately large size of the cranium as compared 

 with that of the face, in this respect approaching that notable skull 

 of Immanuel Kant. The parietal bones are notable for their large ex- 

 panse. The cranial capacity is 1645 cubic centimeters. Full measure- 

 ments and stereographic drawings have been recorded. 



ON A RACIAL PECULIARITY IN THE BRAIN OF THE NEGRO. By 

 Robert Bennett Bean. Department of Anatomy, Johns Hopkins 

 University. 



In a study of thirty-seven brains of the iVmerican Xegro, and after 

 careful measurement and comparison (individually and collectively) 

 with seventeen brains removed from American Caucasians, it is found 

 that the anterior part of the Negro brain is smaller than the anterior 

 part of the Caucasian brain. The difference varies up to ten millimeters 

 actual linear measurement over the anterior association area in brains of 

 the same antero-posterior diameter. This is apparently more marked 

 in women than in men. The uniformity of the difference is striking 

 when we consider that the American I^egro contains various strains of 

 Caucasian blood. 



We believe we have found that the anterior association area with its 

 connections is smaller in the American Negro than in the American 

 Caucasian. The posterior part of the Xegro brain may be relatively 

 larger than the posterior part of the Caucasian l)rain, but this is not so 

 marked, nor is it constant. Wc present only a preliminary note and hope 

 to make a complete report after the examination of a larger number of 

 brains. 



THE MAMMALIAN LOWER JAW. By J. S. Kingsley. Tufts College. 



In several works, notably the manuals of human anatomy, the state- 

 ment occurs that the lower jaw in the mammals ossifies from several 

 centers, but, except in a brief paragraph in one of Kitchen Parker's 

 publications, I have found no attempt to homologise these elements with 

 the bones occurring in the mandible of the lower vertebrates. The work 

 described has been carried on by means of wax reconstructions of the 

 region concerned in embryos of the pig. 



