By Peter Mark Roget

ISBN-10: 110800007X

ISBN-13: 9781108000079

Lower than the phrases of the desire of the Oxford student Francis Henry, Earl of Bridgewater (1756-1829), Fellow of the Royal Society, absentee rector and prepared manuscript-collector, a sequence of books was once commissioned, designed to give a contribution to an realizing of the area as created via God. In 1834 Peter Roget, who was once 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 attract 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 vegetation and animals are obvious as proving God's layout. The arguments came upon right here resonate with debates that proceed this day, in addition to supplying resource fabric for historians of technological know-how.

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

Sample text

All that we are permitted to see are the general results, namely the gradual deposition of the materials of the future alburnum and liber. These materials are first deposited in the form of a layer of glutinous substance, termed the Cambium; a substance which appears to consist of the solid portion of the sap, precipitated from it by the separation of the greater part of the water that held it in solution. The cambium becomes in process of time more and more consolidated, RETURN OF THE SAP. 41 and acquires the organization proper to the plant of which it now forms an integrant part: it constitutes two layers, the one, belonging to the wood, being the alburnum ; the other, belonging to the bark, being the liber.

Several tribes of plants contain liquids that are opaque, and of a white milky appearance; this is the case with the Poppy, the Fig-tree, the Convolvulus, and a multitude of other genera; and a similar kind of juice, but of a yellow colour, is met with in the Chelidonium, or Celandine. All these juices are of a resinous nature, and usually highly acrid, and even poisonous in their qualities; and their opacity is occasioned CIRCULATION IN PLANTS. 49 by the presence of a great number of minute globules, visible with the microscope.

Plants having a fusiform, or spindle-shaped root, such as the carrot and the radish, are the best for these experiments. In the natural progress of growth, the roots are constantly shooting forwards in the direction they have first taken, whether horizontally, or vertically, or at any other inclination. Thus they continually arrive at new portions of soil, of which the nutritive matter has not yet been exhausted; and as a constant relation is preserved between their lateral extension and the horizontal spreading of the branches, the greater part of the rain which falls upon the tree, is made to drop from the leaves at the exact distance from the trunk, where, after it has soaked through the earth, it will be received by the extremities of the roots, and readily sucked in by the spongioles.

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Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology by Peter Mark Roget

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