314 RE.\DINGS 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 CoaposiTiON of Three Plants of Sedum Spectabile Grown in 

 White, Red, and Blue Light 



Substance 



Ash 



Sugar 



Calcium malate 



Free nitrogen 



Starch 



Crude protein 



White 



13.20 



II .04 



22 . 20 



o. 16 



5.82 



5-33 



Red 



13.20 

 15-40 

 18.02 



o 33 

 3.66 



6.15 



Blue 



18.60 



2.40 



18.10 



0-59 

 1 . 20 

 7.64 



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 Bahcock a)id 

 Clausen, after Goldschmidi.) 



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 



