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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. 



Fig. iiy.- — I- 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. 



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. 



