. Cyclopedia of American horticulture : comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening; Horticulture; Horticulture; Horticulture. 1326 PHYSIOLOGY the eonduction of the digested or leaf- formed foods to other parts. Seed Production.—So far as we know, the ultimate function of a plant in nature is to produce seeds or to reproduce its kind. It matters not how far the horti- culturist may have divert
. Cyclopedia of American horticulture : comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening; Horticulture; Horticulture; Horticulture. 1326 PHYSIOLOGY the eonduction of the digested or leaf- formed foods to other parts. Seed Production.—So far as we know, the ultimate function of a plant in nature is to produce seeds or to reproduce its kind. It matters not how far the horti- culturist may have diverted this natural function in particular instances, in general the sum of the physi- ological activities is directed to seed-production. Much energy is directed to the development of form and color in the flower, also of fragrance and odor, and there are deep-seated physiological processes connected with pol- len and ovule production, with pollination, fertilization (see p. 579), and the subsequent development of the seed. Seeds are, as a rule, richer in nitrogenous matter than other parts of the plant. Likewise, in phosphorus and magnesium salts there is a marked increase in the seed. Of these last-named substances, there is a migra- tion, as it were, from the older parts to the region of seed formation, and finally to the seed. On the other hand, the salts of lime gradually increase in quantity in the older tissues, particularly in the old assimilatory tissues. The Living Protoplasm the Seat of Vital Action.— Physiological activities cannot be thoroughly studied by the use of the plant as a whole or by the use of the organs as particular parts of a complex whole. The final seat of all the plant activities resides in the living protoplasm of the cells composing the plant. Except as serving purely mechanical purposes, the old heart wood and bark of trees are inactive, and they contain no liv- ing substance. They are made merely of the hardened walls of cells which once consti
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