Photograph from U. S. Department of Agriculture 



THREE-YEAR-OLD BLUEBERRY HYBRID IN COMMERCIAL BEARING 



This plant is a hybrid between two selected wild stocks, from Greenfield, New Hampshire, 

 and Brown Mills, New Jersey. They were hybridized in the greenhouses at Washington in 

 the summer of 1912 and the hybrid seeds were sown September 9. The young plants were 

 carried over winter in the greenhouse, and early in September, 1913, they were set out at 

 Whitesbog, in the New Jersey pine barrens. The photograph was taken July 27, 1915, when 

 the plant was a little less than three years old. It is about one-fifth natural size. 



must be devised for the rooting of blue- 

 berry cuttings, and a detailed study of 

 the subject was therefore begun. For 

 the first few years the varying course of 

 the experiments with cuttings brought a 

 continual alternation of high hopes and 

 severe disappointments. 



During those years, however, there be- 

 gan to accumulate from the experiments 

 a definite knowledge of what not to do, 

 and at the same time glints of future 

 success came from occasional cutting's 



that did develop roots and grow into 

 healthy plants. At last the way became 

 clear, and now cuttings of the choicest 

 plants can be rooted and grown with al- 

 most the certainty of seedlings. 



THE EFFECT OF COLD 



Some of the discoveries made in the 

 course of this investigation are suffi- 

 ciently curious to be of general interest. 

 One of these is the effect of cold in stim- 

 ulating the growth of the plant. After 



540 



