nS THE STRUCTURE AND LIFE OF BIRDS chap 



animal's part. In the same way when the eyes wink 

 at a sudden flash of light, we call the action reflex. 

 The Frog, whose cerebral hemispheres are no longer 

 in their place, will move its foot when it is irritated : 

 of thus much, lower parts of the brain are capable. 



Fig. 30. — Pra'n of Pigeon (after Parker); A from above ; P, front below; C from 

 left side(x2); cb cerebellum; c.h. cerebral hemispheres; m.o. Medulla Oblongata; 

 n roots of cerebral nerves ; o 1. optic lobes ; olf olfactory lobes ; pn pineal body. 



If the whole brain is removed and only the spinal 

 cord is left, even breathing will not continue. When 

 there is much intellectual power, as in man, the 

 hemispheres arc highly convoluted — i.e., they are a 

 mass of folds and wrinkles. When the bird's skull is 



