122 APPENDIX. 



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 Avere 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 ^vill 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. I have had some plants of the 

 Hudson Bay for three years, in a position where they 

 cannot very easily be impregnated by other kinds, 

 during which time they have not borne 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 exam- 

 ined with a magnifying-glass, to see if I could discover 

 any pollen, but have never been able to find it ; I am 

 forced, therefore, to believe \h2X pistillate plants, both 



