PLATE 2 



EXPLANATION OF FIGURES 



11 and 12 are drawn from whole mounts of the head. The stippling represents 

 the nerve cell layer, the fibrous matter is blank. Obj. 16, oc. 6, stage level, 

 reduced one third., 



11 The head and brain of the worker. 



12 The head and brain of the soldier. 



596 



