92 Jourjial of Cornparative Ncuj-ology and Psychology. 



3. Thus is it not possible and profitableto compare color-blindness (Daltonism), 



in general, and the different cases of achromotropy, partial or total, of the xantho- 



chloro- 



tropic blindness of plants (Wiesner) and of the indifference -. — tropic of 



^ r \ y xantho- 



Lineus in certain stages of the artificial inversion of its chromotropism ? [Personal 



experiments of W. Nagel ('01) upon the artificial transitory blindness for red 



induced by santonin.] 



4. Finally, is it not in this direction that one should look for the explanation 

 of the consecutive colored images (six according to C. Hess ('00) or even more) 

 after a short chromatic stimulation, if one bears in mind the succession of stages 

 in the artificial inversion of chromotropism in my Lineus ? 



