Transmission-time of Reflexes in Spinal Cord of Frot 



45 



Exp. 55. (R. Gastroc). Dec. 11, 1906. Room temp, rising from 10° C. to 

 14° C. One minim 002 per cent. liq. strych. injected four days before, 

 and 2 more minims the day before making the experiment. When 

 this was begun, tlie preparation was in the attitude characteristic of 

 strychnine poisoning. Heart beating but feebly at the end of the 

 experiment. No response of any kind, direct or reflex, could be 

 obtained to begin with, with stimuli weaker than 2000 units. 



Induction current 

 to nerve. 



Time, in thousandths of a second, in 



nutes I rest now 

 I 5 



Crossed reflex. 



Measured 

 time taken 

 by impulse 

 to reach p. 



Time to be 

 deducted 

 for trans- 

 mission 

 from Cm 

 electrode 

 on opposite 



side to p 

 (measured). 



lime to be 

 deducted 

 for trans- 

 mission 

 in nerve 



from one Cu 



electrode to 

 the other 



(assumed). 



Pro- 

 bable 



cord 

 delay. 



48 

 50 



52 

 51 



57t 

 6it+ 



Extra 

 delay 

 in the 

 case 

 of the 

 crossed 

 reflex. 



) 28 or 

 I 25 

 24 



33 



Reflex responses could now be obtained with induction currents of 1000 units, 

 but not with any that were weaker. Ten minutes' rest was given before 

 continuing the experiment. 



effect 

 5 



The *, when it appears in the first column, denotes that the big resistance 

 had been removed from the secondary circuit when the particular 

 response was evoked. 



