By Peter Mark Roget
Below the phrases of the desire of the Oxford pupil Francis Henry, Earl of Bridgewater (1756-1829), Fellow of the Royal Society, absentee rector and prepared 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 was once on the time compiling his celebrated word list, contributed a two-volume treatise to that debatable sequence, which shaped a part of the complicated highbrow historical past to Darwin's paintings on evolution. Roget defined, in a fashion 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 capabilities of person crops and animals are noticeable as proving God's layout. The arguments came upon the following resonate with debates that proceed this present day, in addition to offering resource fabric for historians of technological know-how.
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Extra resources for Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology
112. AERATION OF THE SAP. 29 of the cells or vessels, to which they are conducted from the leaves. 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.
45 and occasion the detachment of the leaves, which thus fall off at the end of each season, making way for those that are to succeed them in the next. § 6. Secretion in Vegetables. the powers of the simpler kinds of cells are adequate to produce in the returning sap the modifications above described, by which it is converted into gummy, saccharine, amylaceous, or ligneous products ; there are other cellular organs, endowed with more extensive powers of chemical action, which effect still greater changes.
The proportion of water which the sap loses by exhalation in the leaves is generally about two-thirds of the whole quantity received ; so that it is only the remaining third that returns to nourish the organs of the plant. It has been ascertained that the water thus evaporated is perfectly pure; or at least does not contain more than a 10,000,OOOth part of the foreign matter with which it was impregnated when first absorbed by the roots. The water thus exhaled, 28 THE VITAL FUNCTIONS. being dissolved by the air the moment it escapes, passes off in the form of invisible vapour.
Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology by Peter Mark Roget