On the relative length of the period of latency of the ocular muscles etc. 153 



action upon the eye muscles than is that of the posterior centres, for in 

 all the curves the period of latency of the posterior centres is greatly 

 prolonged as compared with that of the anterior. On the other hand, 

 when two posterior centres (temporal and occipital) are compared in the 

 same way, the period of latent excitation is almost exactly the same 

 in both. As an example of the results I append tables giving a few 

 of the measurements of alternating excitations taken in the manner 

 described on different occasions and selected from a large number of 

 such series. Fig. 2 represents such a series as actually recorded. 



Table I. 



In this table F denotes excitation of frontal region, T of the first 

 temporal gyrus. The periods of latent excitation are given in seconds. 



F 



T 



F 



T 



F 



T 



F 



T 



F 



T 



. 1 



.175 



. 1 



.175 



.075 



. 15 



.075 



.112 



.075 



.15 



.05 



.112 



.075 



.112 



.075 



.112 











. 1 



. 2 



. 1 



. 2 



.075 













. 2 



. 25 



. 15 



. 3 



. 2 



. 15 



. 1 











. 25 



. 12 



. 25 



. 12 



. 15 



. 05 









Table 11. 

 In this table F denotes excitation of frontal region, and of the 

 surface of the occipital lobe. 



F 







F 







F 







F 







F 







.125 



. 4 



.125 



.35 



. 1 



. 35 













. 2 



. 15 



. 2 



.125 



.175 



.15 



.2 



.15 



.2 



. 2 



. 4 



. 2 



.25 



. 15 















.35 



. 1 



. 2 



. 1 



. 2 











. 07 



.13 



. 07 



.25 















