ABSORPTION SPECTRUM OF CHLOROPHYL 



123 



as the first, and both may be regulated by the adjustment screws 

 of the spectroscope. The spectroscope should be provided 



Fig. 60. Heliostat, for reflecting a beam of sunlight from the mirror M constantly 

 upon one spot. 



with small bottles of several sizes for holding solutions of chloro- 

 phyl. Fill the thinnest of these with the solution in alcohol 

 and adjust to the instrument. Compare the spectrum of the light 



hi. 



FlG. 61. /, spectrum of chlorophyl. The three indistinct bands beyond E are 

 shown as one, and are not usually distinguishable with the micro-spectroscope. II, 

 spectrum of amaranth-red in which nearly all of the rays except those between B and 

 D have been absorbed. Ill, spectrum of autumnal coloring matter of Ampelopsis. 

 Nearly all of the light except a portion between C and D has been absorbed. 



