478 



Drs. G. F. Yeo and T. Cash. 



influence of temperature than is the nerve-muscle preparation, as its 

 mass prevents the extreme influences under which the delicate nerve 

 suffers, being felt to such a large extent. The curve also is the 

 expression of the actual effect of a certain temperature upon the 

 muscle only instead of being that on both nerve and muscle. A rise 

 or fall of temperature through a certain number of degrees has a 

 magnified effect on the nerve-muscle preparation compared to what 

 it has on the muscle. 



Table VIII. — Cold and Heat on Curarised Gartroenemius. 



No. 



Weight. 



Temp. 



Length of 

 latency. 



Length, 

 of ciirre. 



Altitude. 



Remarks. 



1 



10 grms. 



19° C. 



1 -7 d. r. 



14-0 d.r. 



24 *5 mm. 



Extends below abscis- 

 sa, single summit. 



2 



5> 



18 „ 



1-8 „ 



14-8 „ 



24-5 „ 



Do. do. 



3 



jj 



17 „ 



1 -85 „ 



16 „ 



24 „ 



Beaches abscissa, 

 single summit. 



4 





13 .„ 



2-0 „ 



20-0 „ 



25 -0 „ 



Beaches abscissa, 











double summit. 



5 



55 



11 „ 



2 -05 „ 



22-75 „ 



26 .„ 



Does not touch abscis- 













sa, double summit. 



6 





9 „ 



2 3 „ 



25-7 .„ 



27-0 „ 



Do. do. 



7 



55 



7 „ 



2 5 „ 



38 -0 „ 



30 -0 „ 



Do. do. 



8 



55 



10 „ 



2 3 „ 



30 5 „ 



28-0 „ 



Do. do. 



9 



55 



12 „ 



2 1 „ 



25 „ 



27-5 „ 



Do. do. 



10 





14 „ 



2 „ 



19 -8 „ 



24-5 „ 



Almost touches ab- 

 scissa, flat summit. 



11 



55 



16 „ 



175 „ 



15-4 „ 



25 5 „ 



Extends below ab- 











scissa,single summit. 



12 



55 



18 „ 



1 -7 „ 



14 „ 



27 „ 



Do. do. 



13 





20 „ 



1 6 ,, 



13 4 „ 



27 



Do. do. 



We have before us the result of cooling a curarised muscle down 

 from 19° to 7°, and then of heating it to 20°, and the figures represent 

 fairly the changes in the curve and latency. The total addition to 

 the latency is '8 of a double vibration, -or -0044" whilst the addition in 

 the length of the curve is 24D.V. The interesting fact is well demon- 

 strated in this Table that the greater the influence of cooling through 

 a given number of degrees has been upon the latency, the greater is 

 the effect also on the curve, so that whereas between 19 c and 17°, the 

 latency varies the *15 D.V., and the length of the curve increases only 

 2 D.V.'s between 9° and 7° where the latency increases "2 D.V., the 

 curve lengthens 13 D.V., but it is necessary to remember that it is 

 exactly at this point 9 — 5°, that cold has such a powerful effect in 

 prolonging the curve. The lengthening or shortening of latency and 

 curve accompany each other with considerable precision, though it has 



