How Crops Grow: A Treatise of the Chemical Composition, Structure, and Life of the Plant, for All Students of Agriculture ...Orange Judd, 1868 - 378 էջ |
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agricultural plants albumin albuminoids alcohol aleurone alkalies ammonia analyses animal Arendt ash of plants ash-ingredients atoms bark barley beet bodies boiling buckwheat buds burning carbonic acid casein cell-tissue cells cellulose cent chemical chlorhydric acid chlorine clover color combustion composition compounds contain crystals dextrin dilute dissolved ducts elements exists fact fiber foliage fruit germination glucose grains growth heat hydrated hydrogen ingredients insoluble Inulin iodine juice kernel leaves levulose lime liquid magnesia maize manganese matters membrane metals molecules nearly nitric acid nitrogen observed occur organic osmose oxalate oxide of iron oxygen pectin pectose phosphate phosphoric acid portion potash potassium potato produced proportion pure quantity roots Salm-Horstmar salts seeds silica soda soil soluble solution starch stem substance sugar sulphate sulphuric acid temperature tion tissue trees tube tuber turnip vascular vegetable weight wheat wood yield
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Էջ 49 - The formula of a compound is represented by placing the symbols of the component elements side by side; where more than one atom of the same element occurs in a molecule, the figure expressing this number is written at the right and a little below the corresponding symbol. 25.
Էջ 246 - Henrici surmised that the roots which most cultivated plants send down deep into the soil, even when the latter is by no means porous or inviting, are designed especially to bring up water from the subsoil for the use of the plant. The following experiment was devised for the purpose of establishing the truth of this view. On the 13th of May, 1862, a...
Էջ 20 - A Treatise, showing the intimate Connection that subsists between Agriculture and Chemistry ; addressed to the Cultivators of the Soil, to the Proprietors of the Fens and Mosses in Great Britain and Ireland, and to the Proprietors of West India Estates;" and in 1799, " The Principles of Chemistry applied to the Improvement of the Practice of Agriculture.
Էջ iv - It must not be forgotten," he says, " that a valuable principle is often arrived at from the study of facts, which, considered singly, have no visible connection with a practical result. Statements are made which may appear far more curious than useful, and that have at present a simply speculative interest, no mode being apparent by which the farmer can increase his crops or diminish his labors by help of his acquaintance with them. Such facts are not, however, for this reason to be ignored. It...
Էջ 344 - The colloids just named acquire the power of combining with an increased proportion of water and of forming higher gelatinous hydrates in consequence of contact with dilute acid or alkaline reagents. Even parchment-paper is more elongated in an alkaline solution than in pure water. When thus hydrated and dilated, the colloids present an extreme osmotic sensibility.
Էջ v - ... natural compounds, which constitute the food or the materials of plants. It has also been attempted to adapt the work inform and contents to the wants of the class-room by a strictly systematic arrangement of topics, and by division of the matter into convenient paragraphs.
Էջ 307 - ... compare them as to amount of ash, water or some other constituent. Sach's discovery that "squash seeds, which, when ripe, contain no starch, sugar or dextrine, but are very rich in oil (50^), and albuminoids (40$;), suffer by germination such chemical change that the oil rapidly diminishes in quantity, while at the same time starch, and in some cases sugar, is formed...
Էջ 157 - Anafysen, 1871. been stated that " similar kinds of plants, and especially the same parts of similar plants, exhibit a close general agreement in the composition of their ashes, while plants which are unlike in their botanical characters are also unlike in the proportions of their fixed ingredients.
Էջ 340 - Graham has observed that common salt actually diffuses into water, through a thin membrane of ox-bladder deprived of its outer muscular coating, at very nearly the same rate as when no membrane is interposed.
Էջ 18 - Other qualifications being equal, the more advanced and complete the theory of which the farmer is the master, the more successful must be his farming. The more he knows, the more he can do. The more deeply, comprehensively, and clearly he can think, the more economically and advantageously can he work.