Smithsonian Report, 1910.— Covillo. 
Plate 22. 
Awakening of Long Dormant Plants by Artificial Chilling. 
Thelllu.<?tration consists of two photographs of the same plant. At the left is shown the condition of 
the plant on December 20, 1910, after more than a vear of warmth and dormancy. The figure at the 
right, from a photograph taken April 27, 1917, shows the appearance of the plant after it had been 
subjected to artificial chilling for a period of three months and then had been returned to the warm 
greenhouse. It began to put out new growth from 10 or more of its leaf buds. Even after Us ex- 
traordinarily long period of dormancy the plant had been brought back to normal activity by a 
suitable period of chilling. (One-fifth natural size.) 
