. Beginners botany. Botany. 28 BEGINXEliS' BOTANY oaso-knife boan, aoorn, horse-chestnut. Squash seeds are excellent for germination studies, because the cotyledons become green and leafy and germination is rapid. Onion is excellent, except that it germinates too slowly. In order to study the root development of germinating plantlets, it is well to provide a deeper box with a gUiss side against which the seeds are planted. 12- Observe the germina- tion of any common seed about the house premises. When elms, oaks, pines, or maples are abundant, the germination of their seeds may be studied in l
. Beginners botany. Botany. 28 BEGINXEliS' BOTANY oaso-knife boan, aoorn, horse-chestnut. Squash seeds are excellent for germination studies, because the cotyledons become green and leafy and germination is rapid. Onion is excellent, except that it germinates too slowly. In order to study the root development of germinating plantlets, it is well to provide a deeper box with a gUiss side against which the seeds are planted. 12- Observe the germina- tion of any common seed about the house premises. When elms, oaks, pines, or maples are abundant, the germination of their seeds may be studied in lawns and along fences. 13. When studying germina- tion the pupil should note the differences in shape and size between cotyledons and plumule leaves, and between plumule leaves and the normal leaves (Fig. 30). Make drawings. 14. Make the tests de- scribed in the introductory experiments with bean, corn, the castor bean, and other seed for starch and proteids. Test flour, oatmeal, rice, sunflower, four o 'clock, various nuts, and any other seeds obtainable. Record your results by arranging the seeds in three classes, 1. Much starch (colour blackish or purple). 2. Little starch (pale blue or greenish), 3. No starch (brown or yellow). 15- Bate of growth of seedlings as affect- ed h)/ differences in tempera- ture. Pack soft wet paper to the depth of an inch in the bottom of four glass bottles or tumblers. Put ten soaked peas or beans into each. Cover each securely and set them in places having different temperatures that vary little. (A furnace room, a room with a stove, a room without stove but reached by sunshine, an nnheated room not reached by the sun). Take the temperatures occasionally with the thermometer to find difference in temperature. The tumblers in warm places should be covered very tightly to prevent the germination from being retarded by drying out. Record the number of seeds which sprout in each tumbler within 1 day, 2 days, 3 days, 4 days, etc. 16. Is air neeessar
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