The flower and the bee; plant life and pollination . ruit. Mixed orchards in thevicinity also bore well. He accordingly selected a number ofunopened buds and removed the stamens; and, after pollinatinga part of them with pollen from Bartlett trees and a part withpollen from other varieties, enclosed them in paper bags. Inthe orchard at large a week after the petals had fallen the youngpears all dropped off. Most of the trees were absolutely the flowers enclosed in bags not one pollinated with Bartlettpollen had set fruit, while a large proportion of the crosses withother varieties pr
The flower and the bee; plant life and pollination . ruit. Mixed orchards in thevicinity also bore well. He accordingly selected a number ofunopened buds and removed the stamens; and, after pollinatinga part of them with pollen from Bartlett trees and a part withpollen from other varieties, enclosed them in paper bags. Inthe orchard at large a week after the petals had fallen the youngpears all dropped off. Most of the trees were absolutely the flowers enclosed in bags not one pollinated with Bartlettpollen had set fruit, while a large proportion of the crosses withother varieties produced pears. As there were many pollinat-ing insects present, it is evident that had there been othervarieties of pears scattered through the great orchard all of thetrees would have yielded well. The Bartlett pear is largelyself-sterile. (Fig. 115.) 265 THE FLOWER AND THE BEE Waite then experimented with 144 pear-trees belonging to38 varieties. More than half of them when self-pollinatedproved to be wholly or nearly self-sterile; among which were. Fig. 115. Common Pear. Pijrus communis Bartlett, Anjou, Clapps Favorite, Howell, Lawrence, andWinter Nelis. Self-fertile varieties were Angouleme, Bosc,Buffum, and Flemish Beauty. Most of the fruit, however,seems to be the result of crossing, since pollen from other varie-ties is prepotent over own pollen in the self-fertile varieties. 2G6 BEES AND FRUIT-GROWING Pears produced by crossing are larger and more perfect thanthose which come from self-fertihzation. Like the pear many varieties of apple are self-sterile. Of 87varieties tested by Lewis and Vincent in Oregon, 59 were foundto be self-sterile; 15 were self-fertile, but gave better resultswhen pollinated by some other variety; and 13 were partiallyself-sterile. Among the self-sterile varieties were Bellflower,Gravenstein, King, Rhode Island Greening, Tolman Sweet,Wealthy, and W^inesap; among the self-fertile were Baldwin,Oldenburg, Shiawassee, Washington, and Yellow Newton;par
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