Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 96 ELEMENTARY STUDIES IN INSECT LIFE pollen does fall upon its own stigma, by rendering this sterile to its own ovule but fertile when transferred to the flower of another variety of the same stock. Briefly and in a general way, this sums up the advance of our knowledge upon this interesting subject. Many subse- quent investigations have elaborated these principles by the detailed study of various forms of flowering plants. cP P FIG. 72. Enlarged section of a Bartlett pear flower: sf, styl
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 96 ELEMENTARY STUDIES IN INSECT LIFE pollen does fall upon its own stigma, by rendering this sterile to its own ovule but fertile when transferred to the flower of another variety of the same stock. Briefly and in a general way, this sums up the advance of our knowledge upon this interesting subject. Many subse- quent investigations have elaborated these principles by the detailed study of various forms of flowering plants. cP P FIG. 72. Enlarged section of a Bartlett pear flower: sf, style ; sp, sepal ; /, filament; a, anther ; s, stigma; p, petal; d, disk ; ov, ovule. (After Waite.) Plants whose Flowers are Sterile to their Own Pollen but Fertile to Pollen Brought from Other Plants of Same Species. More than fifty species of plants have been found to be partially or wholly sterile to their own pollen, but fer- tile to pollen transferred from other plants of the same
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