A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 190
ds a logical approach to this subject. The experiment should later be followed by one or more upon the development of animals, such as the chick, the frog, the mosquito, and the fly. (See Nos. 132, 133, 134, and 135.) Materials. — A simple flower such as, for instance, the wild mustard, sage, sweet… … Fig. 98 (T).1 exist primarily for this purpose. Many plants put practically all their energy and food into producing seeds, and often give up their lives in developing their seeds. Mention as an illustration of this last statement, that the foliage of many common garden plants dies when the seeds…
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