234 



JACQUES LOEB AND HARDOLPH WASTENEYS 



group. In the line VI of figure 7 is represented the relative 

 brightness of the various parts of the spectrum for the totally 

 color blind human after Helmholtz. A comparison with the rela- 

 tive efficiency of the various wa^-e lengths for Balanus larvae and 



Wave leiifftrhs in nn 



302.400 4075 416 424432.5441 4494^75466 474 4«6 495 510 525 543 560 578 596 6]5 631 



eudendI^ilim rMosum ' | ■ ! I 



BLUE 



GREEN 



YELLOW 



OPANGE 



( 'hlamydomonas (IV and V, fig. 7) shows that the maximal ef- 

 ficiency is not entirely identical in all three cases. We are not 

 prepared to state whether this is entirely duo to the inadequacy 

 of the methods. 



