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Photograph from U. S. Department of Agriculture 

 BLUEBERRY PLANT, SHOWING THE EFFECT OF COED IN STIMULATING GROWTH 



The stem at the right was kept outdoors, through a hole in the glass side of a greenhouse, 

 exposed to repeated freezing and thawing during the winter months. When spring came 

 this outdoor stem burst into growth, as shown in the illustration ; but the stem at the left, 

 which was inside the warm greenhouse all winter, remained completely dormant. A knowl- 

 edge of this influence of cold in stimulating the growth of the blueberry is of fundamental 

 importance in the propagation of choice blueberries by cuttings. 



537 



