VARIATION 313 
following average numbers of stamens: (1) 9.68, (2) 8.45, (3) 6.54, 
(4) 5.05, (5) 9.47, (6) 7.33. Finally, Klebs subjected similar plants 
from white, red, and blue light to chemical analysis in order to secure 
further evidence of the physiological effects of light of different wave 
Fic. 51.—Sedwm spectabile. The three shoots (taken from a single plant) 
were planted in small pots on March 12, 1904, and placed in different greenhouses, 
TZ, in blue light; JZ, in mixed white light; J//, in red light. Photographed on 
September 30, 1914. (From Babcock and Clausen, after Klebs.) 
lengths. Table I shows the composition of the leaves in three plants 
like those shown in Fig. 51. They were in their respective greenhouses 
from June 6 to September 7. The percentages shown are per I00 g. 
of dry substance. 
In comparing these percentages it should be remembered that the 
plant in white light produced 1324 flower buds and the plant in red 
light 405, while the plant in blue light produced none. This explains 
the higher percentage of ash, nitrogen and protein in the last. On 
the other hand, the amounts of starch and sugar found in the plant 
from white light are decidedly larger than the one from blue light. 
