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BRITToN N L Opening Address
TISCHLER GEoRG Investigations concerning the causation of gametic
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abortion abscission Agric Alexander Lucas anthers Antonovka apple varieties artiﬁcial bags Baldwin beets Beurré bloom blossoms Borovinka breeding buds cells cent cherries Chojuro chromosome number chromosomes commercial compatible crop cross-incompatibility cross-pollination cross-sterility cultivated deﬁnite diploid emasculated embryo experiments factors fertilization ﬁeld ﬁgures ﬁnd ﬁrst ﬁve ﬂowers forms fruit set gametes Genetics germination Gravenstein greenhouse groups grown hand pollination hermaphrodite Hort Horticultural hybrids incompatibility inﬂorescences inﬂuence insects intersexualism Jour Kanagawa male mature McIntosh nitrogen normal observed obtained orchard ovary ovules parent parthenocarpy pear Pearmain percentage physiological pistils plants PLATE plums pollen grains pollen tubes pollen-sterile produced progeny reciprocal cross Reinette seed seedless seedlings self-fertile self-incompatible self-pollination self-sterility selfed set fruit set of fruit signiﬁcance species stamens Stayman sterility stigma studies TABLE temperature tests tion Tottori trees type of sterility vegetative viable Yellow Bellﬂower Yellow Newtown