Photograph from U. S. Department of Agriculture 

 FOUR-YEAR-OLD BLUEBERRY HYBRID 



This is one of a series of hybrids made in 191 1 between selected wild plants of a low- 

 bush blueberry (V actinium angustifolium) and a high-bush or swamp blueberry (V actinium 

 corymbosum), both from Greenfield, New Hampshire. The photograph was taken July 7, 

 1915, in a field plantation at Whitesbog, New Jersey. The bush bore two quarts of berries 

 and is shown about one-sixth natural size. This lot of hybrids yielded at the rate of twenty 

 bushels of berries per acre at a spacing of three by five feet. 



consideration of the puzzling misbeha- 

 vior of blueberry plants in the green- 

 house in winter, the following experi- 

 ment was tried. 



A small opening was made in the glass 

 side of a greenhouse in early January, 

 and through this opening was pushed one 

 of the two stems of a blueberry plant 

 which up to that time had been kept in 

 the warm atmosphere of the greenhouse. 

 The open space about the stem where it 

 passed through the glass was then care- 



fully plugged with moss. During the rest 

 of the winter the plant remained in the 

 same position, the pot and one stem con- 

 tinuing in the warm temperature of the 

 greenhouse, while the other stem, pro- 

 jecting through the glass, was exposed to 

 the rigors of winter, with its alternate 

 freezing and thawing. 



When spring came the outdoor stem 

 burst into leaf in the usual manner of a 

 wild blueberry plant, but the stem that 

 had been in the warm greenhouse all win- 



54i 



