214 Dr. A. D. Waller. 



Exp. 2.— Frog. Sciatic Nerve. R = 80,000 a> * 



Opt. 



No effect. 



Capacity 

 in micro- 

 farads. 



F. 



Pressure 

 in volts. 



V. 



1-44 

 0-72 

 0-36 

 0-18 

 '09 

 -045 



Quantity 

 in micro- 

 coulombs. 



FV. 



Energy 

 in ergs. 



5FT 2 . 



Constant. 

 C. 



Time of fall 

 of energy 

 to i of its 

 original 

 value. 

 t. 



-00035 

 -00085 

 -00200 

 o -00700 

 -05000 



10 -ooooo 



'000504 

 -000612 

 -000720 

 -001260 

 • 004500 

 -450000 



-003629 

 -002203 

 -001296 

 '001 134 

 0-002025 

 -101250 



44700 

 9200 

 1950 

 279 

 19 



0-05 



-000019 

 -000047 

 -000111 



-000388 

 -002770 

 -554000 





'0001 



5 -00 



0-0005 



-012500 



543000 



— 



-000005 



Opt. 



-ooio 



1 -oo 



-ooio 



-005000 



10850 



-000055 



O "OIOO 



O *20 



-0020 



O '002000 



217 



'000554 





o-iooo 



0-13 



0-0130 



-007450 



14 



-005540 





1 -oooo 



O'lO 



0-1000 



0-050000 



1 



0-055400 



Exp. 2. 



14 1-3 



VoLt. 



Influence of Temperature. — The characteristic of nerve is very sensitive 

 to alterations of temperature, being raised by high temperature (30°), and ^ 

 depressed by low temperature (5°). Gotch and Macdonald have shown 

 that stimulation of nerve by break induction shocks is favoured by heat, 

 disparaged by cold, and that stimulation by the constant current is 

 favoured by cold, disparaged by heat (13).f The present experiments 

 show clearly that short stimuli (energy curve of high number) are 



* In the first group of trials given voltages are taken, and the minimum effec- 

 tive capacities sought for. The characteristic = 279. 



In the second group given capacities are taken, and the minimum effective volt- 

 ages sought for. The characteristic = 217. 



f Gr. and M. allrde to condenser excitation, but did not employ it correctly. 

 They supposed that a " short " minimal stimulus coiild be obtained from a con- 

 denser of 0*5 microfarad. 



