

Fig. 3. Comparison of the human brain (A and B) with the frogs brain (C). 



A. Human brain seen from side, c, cerebellum; h, hemispheres; s, stem of 

 brain. 



B. Human brain cut lengthwise to show stem. Dotted outlines show cere- 

 bellum, c, and hemisphere, h. Stem of brain is shown in solid outhne. m, medulla 

 oblongata, positional brain; op, optic lobe, visual brain; ol, olfactory lobe, 

 olfactory brain. 



C. Frog's brain seen from side for comparison with human brain, c, cere- 

 bellum; H, hemisphere; m, medulla oblongata; op, optic lobe; ol, olfactory lobe. 



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