PLATE 31 



A. — Abnormal growth of an unchilled blueberry plant. This plant became dormant 

 in the autumn in a warm greenhouse, and since it was not chilled it continued its 

 dormancy through spring and summer for a period of nine months. Then three of its 

 stems began to die at the tips and, following this, growth began to take place from a 

 single bud next below the dying tip on each stem. For the explanation of this ab- 

 normal activity see p. 156. The photograph was taken October 12, 1916. 



B. — Awakening of long dormant plants by artificial chilling. The illustration 

 consists of two photographs of the same plant. At the left is shown the condition of 

 the plant on December 26, 1916, after more than a year of warmth and dormancy. 

 The figure at the right, from a photograph taken April 27, 1917, shows the appear- 

 ance 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 its extraordinarily 

 long period of dormancy the plant had been brought back to normal activity by a 

 suitable period of chilling. 



