TRANS. AM. PHILOS. SOC, N. S. XXI 



PLATE XVI. 



Fiii. 12. 1. Frontal Aspect of the Brain of a Papuan of British Xew Guinea. 2. Frontal .Vspect of tlie Brain of George Francis Train. Tliis is in many 



respects one of the best developed brains on record. 



Fig. 13. Cross-sections of the brains of the cat, baboon and man — taken at approximately the same plane, and drawn of about tlie same size to better 



show the relatively greater mass of white matter in tlie human brain. 



