314 READINGS IN EVOLUTION, GENETICS, AND EUGENICS 



In short, according to Klebs, in comparison with normal white light, 

 the production of organic substances, such as starch and sugar, is 



TABLE I 



CHEMICAL COMPOSITION OF THREE PLANTS OF Sedum Spectabile GROWN IN 

 WHITE, RED, AND BLUE LIGHT 



diminished under the influence of blue light as microchemical and 

 macrochemical tests distinctly show. In consequence of this dimin- 

 ished assimilation of carbon dioxide the rosettes become purely 



FIG. 52. Above the diurnal peacock butterfly (Vanessa io), and below, forms 

 produced by subjecting the pupae to unusual temperatures. (From Babcock and 

 Clausen, after Goldschmidt.) 



vegetative. In red light the carbon assimilation is greater than in 

 blue light but less than in white. These experiments prove that the 

 transformation of a plant "ripe to flower" into a vegetative one 



