CHAPTER IX. 



POISONS. 



1. Chloroform. — My observations with regard to 

 the distribution of nerves in Sarsia led me to in- 

 vestio-ate the order in which these connections aie 

 destroyed, or temporarily impaired, by amiesthetics. 

 The results, I think, are worth recording. In 

 Sarsia the following phases always mark the 

 progress of antesthesia by chloroform, etc. — 1. Spon- 

 taneity ceases. 2. On now nipping a tentacle, 

 pulling the manubrium, or irritating the bell, a 

 single locomotor contraction is given in answer to 

 every stimulation. (In the unan?esthesiated animal 

 a series of such contractions would be the result of 

 such stimulation.) 3. After locomotor contractions 

 can no longer be elicited by stimuli, nipping a 

 tentacle or the margin of the bell has the effect of 

 causing the manubrium to contract. 4. After stimu- 

 lation of any part of the nectocalyx (including 

 tentacles) foils to pi-oduce response in any part of 

 the or^fanism, the manubrium will continue its re- 

 sponse to stiumli ap[)lied directly to itself. 



2. Nitrite of Aniyl. — On Sarsia the effect of this 

 15 



