. Nature-study; a manual for teachers and students. Nature study. 226 NATURE-STUDY in the way of the bee which, in attempting to go past it, brushes off some pollen against the stigma. When a bee alights on a sweet-pea flower it rests upon the wings and keel of the flower. The weight of the bee de- presses these parts, which makes the stamens and style pro- trude through the end'of the keel. This dusts the bee with. Fig. 76. Sphinx-moth. pollen, and in the next flower this pollen is rubbed off on the stigma. The primrose illustrates another device for cross-pollina- tion. Some of the plants ha
. Nature-study; a manual for teachers and students. Nature study. 226 NATURE-STUDY in the way of the bee which, in attempting to go past it, brushes off some pollen against the stigma. When a bee alights on a sweet-pea flower it rests upon the wings and keel of the flower. The weight of the bee de- presses these parts, which makes the stamens and style pro- trude through the end'of the keel. This dusts the bee with. Fig. 76. Sphinx-moth. pollen, and in the next flower this pollen is rubbed off on the stigma. The primrose illustrates another device for cross-pollina- tion. Some of the plants have flowers with short stamen and long style, and others just the reverse. Insects visiting these flowers transfer the pollen of the short stamen to the short style, and from the long stamen to the long style. The lady's-slipper is a remarkable case. The bee enters by the incurving fold of the slipper. It cannot get out again. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
Size: 1859px × 1345px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkcscribnerss
