52 



Art. 1— K. Fuji: 



Here the ordinate represents tlie interval between the two stimuli, 

 and the abscissa the same between the first stimulus and the 

 commencement of the second response. The length of the abscissa 

 measured from the straight Hue inchned at 45° to the axis, repre- 

 sents the interval between the second stimulus and the commence- 

 ment of the second resj^onse. The curves have a minimum with 

 respect to the abscissa. 



Now from the numbers given in the tables in Lucus's paper, 

 which are reproduced below, I constructed two curves representing 

 the relation between the interval from the second stimulus to tlie com- 

 mencement of the second response and tlie interval between the two 

 stimuli (Plate XII.). Then it was found that the newly reduced 

 carves were simply exponential in agreement with our results. Of 

 course, in this case, the ordinate shows the absolute value of the 

 so-called latent period instead of the ratio of the two modal latent 

 periods. But since the values were obtained by subtracting a con- 

 stant value which may be considered to be the interval Ijetween the 

 beginning of the response and its summit, the nature of the curve 

 must be the same as if it were drawn in our way. 



The tables found in the paper of Lucas are given below. 



Table XXII. 



Exp. o and Exp. 1 1 l>y Lucas. The Journal of Physiology, Vol. 



41, p. 337 and p. 391). 



Exp. 3. 8ciatic-gastrocnemius preparation. Frog. Temp. ITöW 



