. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Plantlet. 43 and to recombine them into foods of various kinds which can be used by the protoplasm in making new parts and in repairing waste {Assimilation (as-sim'-i-la'-tion)). Until this food preparation commences, no new plant sub- stance has been formed. It is true that new cell-walls and new protoplasm may be formed from the food sup- ply of the seed before chlorophyll appears, biit until chlorophyll is formed, and food preparation begins,
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Plantlet. 43 and to recombine them into foods of various kinds which can be used by the protoplasm in making new parts and in repairing waste {Assimilation (as-sim'-i-la'-tion)). Until this food preparation commences, no new plant sub- stance has been formed. It is true that new cell-walls and new protoplasm may be formed from the food sup- ply of the seed before chlorophyll appears, biit until chlorophyll is formed, and food preparation begins, the whole plantlet with whatever remains of the seed, when dried, weighs no more than the seed weighed at the be- ginning. The material formed for food is starch, or some substance of similar composition (sugar or oil), which, after undergoing chemical changes if need be, to render it soluble, is distributed throughout the plant to be built up into cell-walls and protoplasm, or to be held as reserve food (14). Food preparation and assimilation are not necessarily simultaneous, but either may proceed without the other. Only plants can prepare food from mineral substances. The food of ani- mals must all have been first formed by plants. 60. The Sources of Plant Food. By Fig. 16. Showing Observing plantlets of the bean or starch crystals stored as pujjjptin g, fg^ (lays after gcrmina- reserve food m a cell of -^ ^ '' " potato. Highly magni- nation, wc may discover that the coty- ^'^^- ledons, which were at first so plump, have shriveled to a mere fraction of their former size. This change is due to the fact that the food contained by these parts has been absorbed by the developing plant- let. The patrimony furnished by the seed is quickly ex-. 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 Goff, E. S. (E
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