vi VEGETABLE PHYSIOLOGY 
more fully than before the general relations of the in- 
dividual and its environment. 
I have set myself throughout to combat an idea that 
has arisen during the last few years that many changes 
may go on in protoplasm without involving any inter- 
change with its substance. This I hold to be erroneous. 
In all the reactions of which it is the scene its own auto- 
decomposition and reconstruction are involved. 
I have sought to keep the book within practically the 
game dimensions as in former editions, and have conse- 
quently compressed certain of the less important parts. 
When introducing new matter I have tried to avoid undue 
speculation as tending to confuse an elementary student. 
J. REYNOLDS GREEN. 
CampBriper, May 1911. 
