344 



THE FOOD OF PLANTS 



100 

 fa 



so 

 10 

 eo 



a 





\ 



\ 



At <8. Green 



At s. Red 



?t. s. Green 



too 66o eeo &so &w ^oo wo 

 Red Orange Yelfoir I Green Blue 



HO 66 61 St f+ SO 



Red 



X leaves 

 It leaves 

 Ale. Soln. 



Red 



Orange Yellow 



Green 



Blue 



FIG. 



FIGS. 51, *,*. Curve ot absorption (Abs.) and primary assimilation (Ass.) in sun spectrum, after Eneelmann, 

 Hot. Zeitung, '1884, Taf. II. The ordinate for the maximal assimilation = 100. Fij?. 51 gives the curves for green 

 chloroplasticJs (Ass. Green and Abs. Green), and for red algae (Florideae) (Abs. Red and Ass. Red\ and Fig. 52 

 for a blue-green alga (Oscillaria) (Ass. BL-gr.wA Abs. Bl.-gr.\ The curve En. gives the distribution of energy 

 in the spectrum, after Langley (Annal. d. chim. et d. phys., 1882, v. se>., T. XXV, p. an ; cf. also Engelmann, 1. c., 

 p. loa). The median figure is after Reinke (Dot. Zeitung, 1884, p. 59, and PI. I>, and gives the absorption spectra of 

 two and of seven superposed leaves (a leaves and 7 leaves} as well as of an alcoholic solution (Ale. Sol.) of leave* of 

 Inipaticns parviflora. 



