108 _ APPENDIX. 
not bloomed. The flowers expanded well under the 
glass, but did not produce one berry. The plant was 
frequently agitated to put the pollen in motion, if 
there was any. 
I also introduced under a glass some blossom buds 
before they had blown. These, as they successively 
expanded, showed no signs of swelling. I impreg- 
nated, at different times, two of the blossoms by hand, 
applying the pollen from another plant with a camel’s 
hair pencil. These two set their fruit perfectly. The 
pistils of the other blossoms soon turned to a dark 
color. These experiments were made at the north 
side of ‘a picket fence, where the plants were screened 
from the full effects of the sun, otherwise the heat 
under the glasses would have been too great. 
These experiments prove, to my mind, very conclu- 
sively, that Hovey’s Seedling will not bear any fruit 
unless impregnated by some staminate variety. And 
the same may be said of other varieties in which the 
stamens are obsolete. Ihave had some plants of the 
Hudson Bay for three years, ina position where they 
cannot very easily be impregnated by other kinds, 
during which time they have notborne one berry, while 
other plants of the same variety, exposed, have been 
productive. A difference in the formation of the 
flowers on different plants is not confined to cultivated 
kinds, but may be seen in those growing wild in the 
fields, the pistillate plants of which I have often exa- 
mined with a magnifying-glass, to see if I could dis- 
cover any pollen, but have never been able to find it; 
I am forced, therefore, to believe that p/stillate plants, 
both wild and cultivated, are absolutely devo 
