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THE ANIMAL SYSTEM. 117
BRAIN AND NERVE.
Primitive fibers and ganglionic globules of human brain, after Purk-
lnje. a, ganglionic globules lying among varicose nerve-tubes and
blood-vessels, in substance of optic thalamus; a, globule more en
larged; 6, small vascular trunk, b, b, globules with variously-formed
prolongations, from dark portion of crus cerebri.
While tho surface of the brain seems to be the seat
of the soul, its internal portion seems made up of con
necting fibers. In the base of the brain appears to be
the seat of sensation, where all external impressions
are received. Here center the nerves of sight, hear
ing, taste, smell, and the wide and varied sense of feel
ing. These sensations, it is supposed, are conveyed to
their appropriate cerebral organs, where they become
perceptions, and the food of thought, sentiment, and
passion.
I shall not need to enlarge upon the phenomena of