Smithsonian Report, 1919. — Coville. 
Plate II. 
Dormant Wild Crabs Stimulated TO Growth by Girdling and by Notching 
THE Stem. 
These plants had had the same preliminary treatment as the one illustrated in Plate 10, that is, 
they had been kept in the warm greenhouse all winter, without cliilling, dormant and leafless. 
On April 4 a ring of bark was removed from the plant shown in the left-hand figure, and the 
soft cambium was carefully scraped away down tothe hard wood. On April 2-i, when the ])hoto- 
graph was made, the bud next below the girdle had begun to push. In the case of the right- 
hand plant the stem was notched in early April. The bud next below the notch soon began to 
grow, and the photograph was taken on May 2. (Naturalsize.) 
