THE STRUCTURE AND LIFE 

 120 jio 100 ,9 cfo w fo 3i> 



7" 



4o 



3 



S 



I \\ \II\ III JV 



J'Aj/axrant/iifie 



\ \- 



ii I 



Or&n coloring matter 



OBQ 



Fig. 3- 



Spectra given by certain diatoms and by chlorophyl (after P. Petit. Copy 

 Engraving belonging to R.M.S. ) 



I. Chlorophyl of higher plants. 



3. Pxycoxanthin extracted from diatoms. 



3. The green colouring matter (chlorophyl) of diatoms. 



4. 5. . 7. Spectra of the endochrome of various diatoms. 



