170 
COMPARATIVE ZOOLOGY. 
Man and the Apes do we find the cerebrum so highly 
developed as to overlap both the olfac- 
tory lobes in front and the cerebellum 
Bia. 137.—Brain of 
the Perch, upper 
view: a, cerebel- 
lum; b, cerebrum; 
ce, olfactory gan- 
glia; 7, olfactory 
nerves; g, supple- 
mentary lobes. 
behind. 
Functions of the Brain. 
—The cerebrum is the 
source of intelligence and 
will. It has no direct 
communication with the 
outside world, receiving 
its consciousness of ex- 
ternal objects and events 
through the spinal cord 
and the nerves of special 
sense. The nerves of smell 
and sight alone come 
from the cerebrum.”* 
The cerebellum seems to preside over 
the muscular movements. 
When re- 
Fig. 138. — Brain of the 
Frog, upper view, X 4: 
I, olfactory nerves; Lol, 
olfactory lobes; He, cer- 
ebral hemispheres; Pn, 
pineal gland; Fho and 
Srh, third and fourth 
ventricles; Lop, optic 
lobes; ©, cerebellum ; 
Mo, medulla oblongata. 
moved, the animal desires to execute the mandates of the 
Fig. 139.—A, C, upper and side views of the Brain of a Lizard. B, D, upper and side 
views of the Brain of a Turkey: OLf, olfactory lobes; Hmp, cerebral hemispheres; 
Pn, pineal gland; Mb, optic lobes of the middle brain; Cb, cerebellum; 4/0, me- 
dulla oblongata; 7d, optic nerves; iv and vi, nerves for the muscles of the eye; 
Py, pituitary body. 
