PLANT PROPAGATION 



121 



From the flower-buds of one type of orange trees he removed all 

 the stamens before blossoming time, and then covered the pistils 

 with paper bags to prevent the visit of insects bringing pollen. A 

 second set of buds on trees of the other type were likewise covered 

 with paper bags to prevent possible mixing of pollen by insect visi- 

 tors. When the stamens of one kind of orange blossoms and the 



TRIFOLIATE 



FIG. 57. Fruits of two parent plants (orange and trifoliate) at left. Six 

 types of hybrid fruits (Rusk, Willits, 783, 771, 772, 767) developed 

 by cross-pollination from the parent plants, all being good fruits except 

 767, which proved to be worthless. Compare seeds and pulp in various 

 sections. 



pistils of the other kind had matured, the bags were carefully 

 removed, and the pollen of one variety was dusted over the pistil 

 of the other (see 87). The paper bag was then replaced over 

 the artificially pollinated pistil, and the latter left to ripen. Fruits 



