Smithsonian Report, 1919.—Coville. PLATE 13. 
DORMANT BLUEBERRY BUD STIMULATED TO GROWTH BY RUBBING THE STEM. 
The photograph, which was taken June 14, 1913, shows a single bud starting into growth on a 
dormant blueberry plant. The dark area just above the bud is a brown band on an otherwise 
green stem. It shows the position of a rubbing that was given the stem with a smooth knife 
handle a few weeks earlier. This bud afterwards grew into a long vigorous branch, while all the 
other buds remained dormant. (Naturalsize.) 
