26 PROTOPLASM AND PLANT CELLS 
REFERENCE BOOKS 
B. M. Davis, Studies on the Plant Cell (American Naturalist, 
(1904-1905, Boston). 
STRASBURGER, Jost, SCHENCK AND Karsten, Lehrbuch der 
Botanik, 11 Ed., Jena, 1911 (or English Edition), and the 
12 German Ed. 1913. 
