. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 327 simple cases of cross-pollination, such as the sweet pea, the morning-glory, sweet clover, etc. Try this experiment: Tie over a sweet pea bud or a red clover head a paper or muslin bag. The flower so treated will not form seeds. In many flowers there is provision, however, for the pollen to come in contact with the stigma of the same flower. Self-pol- lination thus takes place and seeds will form. A better experiment is this: Select some flowers that fiave pistillate and stami- nate flowers separate, wher
. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 327 simple cases of cross-pollination, such as the sweet pea, the morning-glory, sweet clover, etc. Try this experiment: Tie over a sweet pea bud or a red clover head a paper or muslin bag. The flower so treated will not form seeds. In many flowers there is provision, however, for the pollen to come in contact with the stigma of the same flower. Self-pol- lination thus takes place and seeds will form. A better experiment is this: Select some flowers that fiave pistillate and stami- nate flowers separate, where 5elf-po]hnation is impossi- ble. The squash, pumpkin 3r cucumber is very good For this. Cover the pistil- late flower so insects can- lot get at the stigmas, and 10 seeds or fruit will form. This will bring out well ;he importance of the sta- nens and pistil and also of the process of pollination. Re- :er to the subject of cross-poUination as treated under In- jects, page 224. In these grades also a simple study may be made of another method of polHnation, namely, by the wind. Get the pen- dulous catkins of cottonwood and butternut, the staminate. Fig. 126. Pollination in Sweet 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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