160 NERVOUS CORRELATION 



and therefore without memories. Suppose that before 

 the eyes of the baby an ordinary bell is held. The 



Fio. 44. — Thp Htiman Nervous System, showing the main nerve 

 trunks roinmunicatinn with the spinal cord, which extends down- 

 ward from the hrain into the body. Within the si)inal cord the 

 sensory nerves from contact or internal receptors may make direct 

 connections with motor nerves to eflFectors, and also, by means of 

 conncctinj? nerves, may make indirect connection with the brain. 



Martin. Human Body. 



