STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 301 



and cinerea). So much has been said of the gray matter and its constituent nerve-cells 

 that the very notable researches of Flechsig and his co-workers in the field of myelin- 

 development is often overlooked. Were it not for the manifold connection of such 

 cells with each other, as well as with the periphery by means of the millions and 



Fig. 76. Outline drawings of the cross-section of the callosuiu of 1. Professor Joseph Leidy, morphologist ; 2. Dr. 

 Edward C. Seguin, neurologist ; 3. A laborer, white ; 4. A negro. 



millions of fibers, such a brain, as already pointed out, would be as useless as a multi- 

 tude of telephone or telegraph stations with all inter-connecting wires destroyed. The 

 bulk of (normal) white matter in the brain therefore signifies elaborated gray matter 

 and hence the significance of brain-weight in relation to Ijrain-powers ; for even 

 though there be, as has been computed, over nine l>illion cells in the cortex, their 



