Smithsonian Report, 1919. — Coville. 
Plate 8. 
Blueberry Cuttings Starting to Grow at 36° F. 
These cuttings were placed in cold storage while still completely dormant. Although 
the temperatiu-e did not go above 36° F., buds on each of the cuttings finally began 
to push, as shown in the illustration. It is to be noted that although growth took 
place in the buds the other kind of growth, which results in the formation of a callus 
or healing-over tissue, at the severed base of the cutting, is wholly lacking. Callus- 
ing can not take place at so low a temperature. (Natural size.) 
