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 
Waiter, RED, AND BLUE LicHT 
Substance White Red Blue 
ASH: 2244.4 neaieumedetcadaeeeeeus Gees 4 13.20 13.20 18.60 
URAL s widivens chen ahi dayiva i reasaanuate Buen aruesare II.04 15.40 2.40 
Calcium malate................00.000 0 22.20 18.02 18.10 
Free nitrogen.......... 0c cece eee eeees 0.16 0.33 0.59 
Starch....... iiait J Bia iainch sans Ae mee 5.82 3.66 I.20 
Crude ‘protein, 0... 5.26 swwsnena cae eaaes 5-33 6.15 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 
Fr, = 
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li 
ie 
Fic. 52.—Above the diurnal peacock butterfly (Vanessa 10), 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 
