Smithsonian Report, 1919.—Coville. PLATE 21. 
BLUEBERRY PLANT FORCED INTO FLOWER IN SEPTEMBER BY ARTIFICIAL 
CHILLING. 
The plant that bore this cluster of flowers was brought indoorsin late winter. Itmadenew growth 
and during the cool weather of May it laid down flowering buds for the next year, as a blueberry 
plant ordinarily doesin autumn. During the summer, however, the plant was given an arti- 
ficial winter by chilling it for three months in an artificially refrigerated glass-covered frame 
exposed to daylight. When brought out of the frame, in September, the plant promptly 
flowered, as shown in theillustration. (Natural size.) 
