0-35 



0-30 



0-25 



I 0-20 



0-15 



0-10 



0-05 



100 



«n 



^ 50 



c 



X) 



E? 



Z 



ZJ.b 

 X <o 



E5 



§ 50 



T — n — r~i — r— I — I 11 I I — rn — n — i' i i r i i i i i i — r 



K +• 





/ 



^'X 



/ 



/ 



\ 



\ 



B 



./ 



/ 



^. 



L / 



/ 



I I I I ' I ' 



J L 



''■«'' ' L 



400 



450 500 550 



Wavelength in mp, 



600 



Fig. 1.10. (A) Density spectra, before and after bleaching, of two human 



visual purple solutions ; one (upper curves) heavily contaminated with 



retinal blood, the other (lower curves) relatively pure. (B) The difference 



spectra for these two solutions. 



