THE 



PHYSIOLOGY OF PLANTS 



A TREATISE UPON THE 



METABOLISM AND SOURCES OF ENERGY 



IN PLANTS 



BY 



DR. W. PFEFFER 



PROFESSOR OF BOTANY IN THE UNIVERSITY OF LEIPZIG 



SECOND FULLY REVISED EDITION 



TRANSLATED AND EDITED BY 



ALFRED J v EWART, D.Sc., PH.D., F.L.S. 



WITH MANY ILLUSTRATIONS 

 VOLUME I 







AT THE CLARENDON PRESS n 1 y\ 



\ \s / 1 



M. D. CCCC I V/( i [ 



1 



