On the Latent Period of Muscle Contraction. 473 



Table IV.— Influence of Stimulation. D.Y.= T |^". 



No. 



Weight. 



secondary 

 coil. 



Length of 

 latency. 



Length 

 of curve. 



Altitude. 



Remarks. 



JL 



10 grins. 



20 cm. 



3 /5 d. v. 



19 *4 d. v. 



7 '0 mm. 





2 





18 „ 



3-60 „ 



20-0 „ 



13 „ 





3 





16 „ 



3 "5 „ 



19 -3 „ 



24 -0 „ 





4 



» 



14 „ 



2-75 „ 



19-0 „ 



27 -0 „ 





5 





12 „ 



2 55 „ 



18-5 „ 



26 -5 „ 





6 





10 „ 



2-35 „ 



19-7 „ 



26 -5 „ 





7 





8 „ 



2 "10 ,, 



19 -8 „ 



27 -0 „ 





Q 



O 







2 '05 ,, 



19 -7 „ 



25 





Q 





4 „ 



2 '05 



26 "0 „ 



26 '5 





li 





2 33 

 A 



33 



2 '05 ,, 

 2'15 „ 





37 "0 „ 

 33 



^) Does not regain 



1 9 

 1^ 



13 

 14 





o 



* 33 



4 „ 



„ 



2 "25 

 2 -25 „ 

 2'3 „ 





33 "0 „ 

 27'0 „ 

 20 -0 „ 



abscissa, but 

 ! shows indica- 

 f tion of end 



15 





8 „ 



2 -45 „ 



27 -7 „ 



16 -0 „ 



| of active 



16 





10 „ 



2 '55 



22 5 „ 



13 „ 



J phase. 



17 





12 „ 



3'00 „ 



21 -1 „ 



12 -0 „ 





18 





14 „ 



3 -45 „ 



22 -2 „ 



10-0 „ 





19 





16 



3 *65 „ 



23 -2 „ 



9-5 „ 





20 





18 „ 









21 





20 „ 



3 -8 „ 



23 -0 „ 



8 „ 



J No curve "was 

 \ taken at 12 cm. 



We have here abundant proof, that without exerting a strength of 

 stimulation sufficient to destroy contractility, we can reduce the 

 1 "7 



latency through or the -0094". From the time the secondary coil 



came within 4 centims. of the primary whilst it was pushed " home," 

 and until it was removed again to 8 centims. from the primary, no 

 curve produced reached the abscissa during the passage of the 

 registering plate : there was an alarming viscosity manifested, and we 

 feared injury to the muscle, but on distancing the induction coil a 

 pretty fair recovery was made, the latencies rapidly lengthening, till 

 at the position in which a value of 3 "75 was first obtained, 3 '8 was 

 now recorded, the curve meanwhile, though somewhat (3'6 D.Y.) 

 lengthened, approximated to its primal form. 



This experiment was repeated again with curarised muscles, and the 

 result obtained coincided with our former experience in the abridge- 

 ment which the latency undergoes under increase of stimulation. We 

 give, in Table Y, an illustration of increase of stimulation, ultimately 

 proving fatal to the muscle. 



