22 DISEASE IN PLANTS. 



iodine, in the different parts. Here, again, the 

 maximum coloration coincides with the maximum 

 absorption in and near the red. 



Microscopic observations and photo-chemical 

 experiments alike convince us that the chlorophyll- 

 corpuscle is itself a complex piece of protoplasmic 

 machinery, working for and with the rest of the 

 plant, and there can be little question as to the 

 greater accuracy of our reasoning on the whole 

 question I am discussing, since Meyer, Schimper, 

 Pringsheim, and others have established the im- 

 portance of its structural peculiarities. 



I must now pass on to consider another aspect 

 of the question of carbon-assimilation. 



Notes to Chapter III. 



In addition to the references in the last chapter, the 

 reader may be referred to Sachs' Lectures, XXV., and 

 Pfefifer's Physiology, pp. 329-356, where the \'oluminous 

 hterature is given. 



