Smithsonian Report, 1919. — Covillo. 
Plate 13. 
Dormant Blueberry Bud Stimulated to Growth by Rubbing the Stem. 
The photograph, wliich 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 Ixuni on an otherwise 
green stem. It shows the position of a rubbing that was given the stem with a sniootli knifo 
handle a few weeks earlier. This bud afterwards grew into a long vigorous branch, wliile all the 
other buds remained dormant. (Naturalsize.) 
