140 



From the experiments it appetiiod however tiial at high tempera- 

 tures (22° — 28°) 0, (lid not cause an increase in discliarge. The 

 latter was the case at lower tempei-atiires. Experiments on the 

 influence of narcotics had to he given up at an inopportune moment. 



Fig. 10 demonstrates that by chIoral-h3'drate the discharge disappears 

 nearly comi)letely. 



In the apparatus nerve and organ were kept at the same tempe- 

 rature. It seemed important in order to judge about tlie change 



MMM 



((j<i^^%ii^*H| 



Fig. lOö. Fig. 106. 



a. Record of discharge small electrical b. The same after exposure to chloral- 



organ). Test Vi. volt. hydrate dissolved in Fiihner's solution. 



in the values for the latent period, to submit the nerves separately 

 to changes in temperature. 



Experiment 16. 



Preparation of large Torpedo (28 cm.) made between 11.45 and 12.45 and 

 put into apparatus. 



Piece of organ with two nerves, the nerves led through glass tubes, in which 

 stimulating electrodes. Tubes surrounded by glass-mantle, in which water circulates 

 at different temperatures. 



After the experiment has been ended a control is made by tying off the nerves, 

 which causes a complete breaking of the conduction. 



The magnitude of the deviation remained the same although the 

 temperature of the nerve varied from 20' — 6°. 



The values of the latent periods actually were lower at lower 

 temperatui-es. The measurements are, however, not sufficiently 

 accurate to allow a calculation of the velocity of the conduction. 

 That, however, the differences in latent period found in tlie other 

 experiments are due to changes in the electrical organ, is evident 

 from the fact, that in this experiment the difference between 6° — 20° 

 only amounted to 1.8 o. 



Having thus obtained an impression on the influence of tempera- 

 ture 0, and different salt-solutions on the strengih of the discharge 

 as a responce to indirect stimulation. I have tried to study the 

 gaseous exchange of the electrical organ in rest and during activity. 



F^or this purpose the electrical organ was enclosed in a very thin 



