70 Prof. F. Allen on Four Transition Points in tlie 



Fig. 14. 





, 



i 









04 





i 











h Fatigue colour 



480 fju 









\ Normal 





03 





\ Fatigue ■■ 









\ i 





: 







\ 











\\ 













\\ 







o 



•02 





\\ 

 \\ 

 \\ 







/ 





V 

 \ 





// 











\h6 





' 















•01 













■40/z -50 -60 



Wai/e Length. 



•70 







Table X. 







X. 



Normal 



Eye fatigued 



X. 



Normal 



Eye fatigued 1 



Persistence. 



with X -420 /i. 



Persistence. 



with X -420^. 



•705 p 



•0262 sec. 



•0262 sec. 



•465 f.i 



•0275 sec. 





•665 



•0169 



•0175 



•448 



•0336 



0339 sec. 



•626 



•0144 





•430 



•0392 



•0385 



•577 



•0143 



•0145 



•424 





•0415 



•540 



•0156 



•0153 



•417 



•0450 



•0446 



•512 



•0183 



•0179 



•410 





•0487 



•488 



•0219 



•0215 



•405 



0530 



•0530 



