Smithsonian Report, 1919.—Coville. PLATE 2. 
CHILLED AND UNCHILLED PLANTS OF WILD CRAB, MALUS CORONARIA. 
The plant at the left had been outdoors during the fall and winter, leafless and dormant, 
exposed to the frost and cold. The plant at the right had been in the warm greenhouse 
during the fall and winter at a temperature of 55° to 70° F.and became, like the other, 
leafless and dormant. When the outdoor, chilled plant was brought into the greenhouse 
in the early spring it promptly began to put out new leaves and twigs, as shown at the 
left, but the indoor, unchilled plant continued its dormancy, as shown at the right. The 
photograph was taken April 24,1917. (One-fifth natural size.) 
