Animal and Vegetable Physiology. 2 Volume Paperback Set: by Peter Mark Roget

By Peter Mark Roget

Lower than the phrases of the need of the Oxford pupil Francis Henry, Earl of Bridgewater (1756-1829), Fellow of the Royal Society, absentee rector and willing manuscript-collector, a sequence of books used to be commissioned, designed to give a contribution to an figuring out of the realm as created by way of God. In 1834 Peter Roget, who used to be on the time compiling his celebrated glossary, contributed a two-volume treatise to that debatable sequence, which shaped a part of the complicated highbrow heritage to Darwin's paintings on evolution. Roget defined, in a way designed to entice a large viewers, the range and complexity of the plant and animal kingdoms, focussing on mechanics within the first quantity and body structure within the moment. The interconnected services of person crops and animals are visible as proving God's layout. The arguments stumbled on right here resonate with debates that proceed this present day, in addition to supplying resource fabric for historians of technological know-how.

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Extra info for Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology

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This, then, is the first modification in the qualities of the sap which it undergoes in those organs. § 4. Aeration of the Sap. A CHEMICAL change much more considerable and important than the preceding is next effected on the sap by the leaves, when they are subjected to the action of light. It consists in the decomposition of the carbonic acid gas, which is either brought to them by the sap itself, or obtained directly from the surrounding atmosphere. In either case its oxygen is separated, and is disengaged in the form of gas ; while its carbon is retained, and composes an essential ingredient of the altered sap, which, as it now possesses one of the principal elements of vegetable structures, may be considered as having made a near approach to its complete assimilation, using this term in the physiological sense already pointed out.

I I . C 18 THE VITAL FUNCTIONS. * But in the form of carbonic acid, this element is received in great abundance, through the medium of water, which readily absorbs it : and a considerable quantity of carbon is also introduced into the fluids of the plant, derived from the decomposed animal and vegetable materials, which the water generally contains. The peculiar fertility of each kind of soil depends -principally on the quantity of these organic products it contains in a state capable of being absorbed by the plant, and of contributing to its nourishment.

I I . C 18 THE VITAL FUNCTIONS. * But in the form of carbonic acid, this element is received in great abundance, through the medium of water, which readily absorbs it : and a considerable quantity of carbon is also introduced into the fluids of the plant, derived from the decomposed animal and vegetable materials, which the water generally contains. The peculiar fertility of each kind of soil depends -principally on the quantity of these organic products it contains in a state capable of being absorbed by the plant, and of contributing to its nourishment.

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