QS ON THE NATURE AND ACTION OF THE 



wriggling motion. The poisoned leg at once reacts when the 

 toes arc pinched ; the ligatured one does not. 



When the sides of the frog are irritated by an electric spark, 

 all the legs, except the ligatured one, give a twitch. 



3.50. On exposing the lumbar nerves in the abdominal cavity 

 and irritating them by an induced current, the poisoned leg 

 contracted, the ligatured one did not. 



The efiect of the alcoholic extract in causing paralysis is 

 shown by this experiment ; but the insensibility of the ligatured 

 leg, which was in all probability due to an injury of the sciatic 

 nerve by the ligature, renders it difficult to say how much of 

 the paralysis was due to the cord, and how much to the nerves. 

 That the nerves were affected, however, seems clear from the 

 fact thar. the muscles no longer reacted to voluntary stimuli, 

 but did so when an extraordinary stimulus was occasioned by 

 pinching. 



Experiment XLIV. 



August 27th. — A small dog was chloroformed, and both vagi 

 were exposed. 



12.35 P.M. About two grains of dried cobra-poison were 

 injected into the peritoneal cavity. 



12.42. Water was thrown over the animal to revive him more 

 completely from the chloroform. Bowels acted. He is very 

 unsteady on his legs. Looks drunk. 



12.44. Dog vomits freely. 



12.45. Both vagi divided. The vomiting ceased, the breathing 

 became very slow, and the head was thrown up with the nose in 

 the air. 



12.53. Has become very quiet. Falls down on his side. The 

 vomiting has not recurred. 



12.55. Dead. Artificial respiration commenced. 



1.12. On laying bare the skull and trephining, slight reflex 

 movements occurred in the limbs. 



1.17. Micturated. On irritating the exposed cerebrum by a 

 Faradic current no contractions occurred in the limbs. 



1.47. The spinal cord was exposed and irritated by a Faradic 

 current, No contractions occurred in any of the muscles, except 

 those to which the current was conducted, even when the 



