BOOKS AND CURRENT LITERATURE 



217 



bill with spherical cells to which iodine imparted an intense brown color. 

 Experiments with several kinds of bicarbonatcs indicated that the cal- 

 cium, potassium, and sodium compounds were the most favorable 

 sources of carbon dioxide for the process of photosynthesis, manganese 

 bicarbonate gave no results, and ammonium-carbonate was toxic— C". 



JUDAY. 



