4 68 



ZOOLOGY 



and the growing language would tend to train and improve 

 one another. The brain working through the hands, means the 



Pic. 248. Brain of Hottentot woman. From Mill's "Text-book of Animal Physiology," Copy- 

 right D. Appleton & Co. Lettering as in Fig. 247. 



FIG. 249. 



FlG. 249. Brain of Gauss, the mathematician. From Mill's "Text-book of Animal Physiology;' 

 Copyright D. Appleton & Co. Lettering as in Fig. 247. 



Questions on Figs. 247-24Q.--Identify and compare the cerebrum in these 

 three brains. What are the chief differences? Compare the mass in front of the 

 fissure of Silvius (that is the frontal lobe), in the three. What is the reason of the 

 connection between the numerous convolutions and mental development? Which 

 increases more, the cerebrum or the cerebellum, as we ascend the scale? The 

 meaning of this? 



