286 THE. SNAKES: OF SOUTH AFRICA: 
which stirs us, every hope and ambition which thrills us, the 
glow of love which goes out from us, the pain, the anger and 
the worries of life. Yes, all these and more, have their birth in 
the groups of cells which are formed in this thin grey layer which 
covers our brain like a cloth. 
THE HUMAN BRAIN. 
Fic. 115.—1. The layer of Grey Matter composed of tiny cells where all intelligence, emotions 
and desires have their origin. This is the ‘‘ Book of Life ’’—the phonographic record. 
2. Interior portion of the brain composed of vast numbers of nerve fibres which conduct 
messages to and from the Grey Cells. 
3. The Cerebellum or Little Brain cut in half to show nature of its substance. It is the seat 
of various physical functions and the amative desires. 
4. Top of the Spinal Cord known as the Medulla Oblongata showing nerves branching out 
from it. 
5. Top of Medulla Oblongata known as the Bulbs. This and the former are strongly affected 
by Cobra venom. 
6. The Cerebrum (left hemisphere) showing the convolutions or foldings of its surface. 
7. Right side or hemisphere of the brain. 
The grey cells which envelop the brain-substance follow the 
convolutions down into all their foldings. This wonderful grey 
coating is known as the Cortex, which means bark. 
