

/JO 



/o 



20 



30 



40 



T/me — /^tnufes 



Fig. 4. Dark adaptation of the eyes of Dr. Guttmann, determined by Piper. 

 •Guttman is also an anomalous Trichromat. 



5.0 



AO 



I 



•^ 3.0 



I 



^ 



2.0 



/.O 



/O 20 30 



T/me — • /^/nufes 



-A3 



Fig, 5. Dark adaptation experiment with Dr. Demaria as subject. Normal 

 trichromatic vision. Piper's data. 



510 



