THE NERVOUS SYSTEM. 



Ill 



II. THE REFLEX ACTION OF THE SPINAL CORD OF A 

 FROG. 



Materials. A frog. Chloroform. Hydrochloric acid. Cotton batting. 

 Apparatus. Bell-jar. Ring-stand. 



Etherize a frog, and as soon as it is unconscious sever 

 the brain from the spinal cord by a cut across the back of 

 the neck. With a probe destroy the brain and suspend 



FIG. 11. A diagram of the reflex action of the spinal cord. 



the frog from an iron stand. By pinching with the 

 forceps, gently stimulate one foot of the frog. Give a 

 more vigorous stimulus and compare the result with that 

 previously obtained. 



