Transmission-time of Reflexes in Spinal Cord of Frog 



41 



Exp. 48. (R. Gastroc). Nov. 27, 1906. Room temp. 16° C. (see p. 13). 

 No reflex responses could be obtained to excitation of the nerve of the 

 opposite side, even with strength of current 14,000, while the responses 

 to excitation of the nerve of the same side of which the time measure- 

 ments are given on p. 13, were showing quite strong reflex effects. 

 It was even then very small, but two records of it were taken. 



Induction current 

 to nerve. 



Time, in thousandths of a second, in 



Same limb reflex. 



Strength, ^ire^" 



14,000 

 10,000 

 14,000 

 14,000 



Assumed 

 time to be 

 deducted 

 for trans- 



Pro- 

 bable 

 cord 

 delay. 



in nerve. 



1-7 

 1-7 



10-8 

 10-8 



Crossed reflex. 



Time to be I Time to be 



deducted deducted 



Measured for.tra»s- for trans- p^ 

 time taken J°'t^>°» P"*^'°° bable 



to reach p. ^,j opposite , electrode to ; ^^^^^ 



side top I the other 



(measured), (assumed). 



35 

 31-5 



3-7 



2-6 



2-6 



29-7 

 25-2 



Extra 

 delay 

 in the 

 case 

 of the 

 crossed 

 reflex. 



18-9 

 14-4 



Bag of ice then put on the back of the preparation for \ hour. 



5-5 



6 

 4-5 



4-5 



37-5 

 36 



1-7 



i-V 



1-5 



i-3 



4 



66-5t 34 

 66-5 33-7 



66-8 I 

 67-5 I 



72-8t 



35 

 32'8 



39-3 



or I 

 40-8 



The two kinds of reflexes closely resembled one another in their effects 

 after the cord had been cooled. None of the effects were strong, and 

 in the 1st and 5th crossed-reflex responses and in the 3rd uncrossed 

 one, the maximal strenofth was not attained at once. 



