. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 329 Later in the summer, grasses should be studied. It will be seen that here also the wind is the chief agent in pollina- tion. Have the children realize that trees, grasses, and weeds are also "; In grammar grades still more may be done with the study of flowers and poUination. Pe- cuhar modifica- tions of flower structure to en- sure cross-poUi- nation should be considered, such as the lady's- shpper, Jack-in- the-pulpit, and other flowers. Here we can re- fer to the pur- pose of cross- p
. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 329 Later in the summer, grasses should be studied. It will be seen that here also the wind is the chief agent in pollina- tion. Have the children realize that trees, grasses, and weeds are also "; In grammar grades still more may be done with the study of flowers and poUination. Pe- cuhar modifica- tions of flower structure to en- sure cross-poUi- nation should be considered, such as the lady's- shpper, Jack-in- the-pulpit, and other flowers. Here we can re- fer to the pur- pose of cross- pollination; namely, that by it rather than by self-pollination larger and better seed, and consequently better and stronger offspring, are produced. Most plants seem to try to effect cross-polhnation, while many, like the plants that have only stamens or only pistils in a flower, make self-pollination impossible. Let the pupils try some experiments in pollinating flowers by hand. With a small water-color brush or a feather take off some pollen from a flower and transfer it to another flower of the same kind. Pollinate in this way differently colored varieties. Pistillate and Staminate Flowers from Separate Boxelder 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
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