68 IKON COMPOUNDS IN CHLOROPLASTS 



product of photo- synthesis induced by the iron- containing com- 

 pound. 



5. These facts afford an explanation of chlorosis, and its cure 

 by inorganic iron salts, and demonstrate that iron is a primary 

 essential in photo-synthesis and the production of chlorophyll. 



6. The iron-containing substances of the colourless portion of 

 the chloroplast, and the chlorophyll produced by them, then become 

 associated in the functions of photo-synthesis as a complete 

 mechanism for the energy transformation. 



