Smithsonian Report, 1919. — Coville. 
Plate 6. 
Blueberry Plant with One Branch Stimulated to Growth by 
Cold. 
The right-hand branch has been stimulated to growth by cliilUng; the left-hand branch 
has been kept dormant by heat. For a detaUed description of this experiment see page 283. 
(One-seventh natural size.) 
