. Elements of scientific and practical agriculture : or, The application of biology, geology, and chemistry to agriculture and horticulture. 32 BIOLOGY OF PLANTS. In Fig. 2, c represents the pith, b the heart wood, a the al-burnum, II m the bark. The annual layers of wood, the medul-lary rays and the tubes are also represented in tliat figure, whichis a representation of a section of the branch of a tree. 10. The process of converting tlie cambium into alburnumand other vegetable substances, such as sugar, gum, starch, called assimilation ; that of rejecting matter by the roots, ex-cret
. Elements of scientific and practical agriculture : or, The application of biology, geology, and chemistry to agriculture and horticulture. 32 BIOLOGY OF PLANTS. In Fig. 2, c represents the pith, b the heart wood, a the al-burnum, II m the bark. The annual layers of wood, the medul-lary rays and the tubes are also represented in tliat figure, whichis a representation of a section of the branch of a tree. 10. The process of converting tlie cambium into alburnumand other vegetable substances, such as sugar, gum, starch, called assimilation ; that of rejecting matter by the roots, ex-cretion and by the leaves, transpiration. When substances arethrown off from the leaves, they are also said to be exhaled; andwhen they are taken in by the leaves, they are said to be inhaledor absorbed. Agricultural Chemistry is a term which has been generally usedto denote the ai)plication of science to Agriculture. It attemptsto explain the ijifluence of earth, air and water upon plants. That branch of the subject, which relates to the soil, as formedof simple minerals and rocks, is sometimes called AgriculturalGeology. But as the chem
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