PLATE 23 



Blueberry plant with one branch kept dormant by heat. 



A. — Dormant indoor blueberry plant as it appeared on February 15, 1912. On that 

 date the pot containing the plant was placed on a shelf outside a greenhouse, and a 

 single branch was passed through the glass wall into the warm interior. 



B. — Same plant photographed May 21. When spring came, all the outside branches, 

 which had been chilled, burst into normal leaf, while the branch inside the greenhouse, 

 which had been kept warm, still remained dormant. 



