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This manual is, in substance, the author's “Lessons in Elementary ''Botany” adapted for use in India. In preparing it he has had in view'' the want, often felt, of some handy résumé of Indian Botany, which might be serviceable not only to residents of India, but also to any one about to proceed thither, desirous of getting some preliminary idea of the Botany of ''that country. “It contains a well-digested summary of all essential know&shy;ledge'' pertaining to Indian botany, wrought out in accordance with the best principles of scientific arrangement.” —.

Other volumes of these Manuals will follow.

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The author's aim has been to create in the mind of the student physical ideas corresponding to theoretical laws, and thus to produce a work which may be regarded either as a supplement or an introduction to manuals of ''theoretic mechanics. To realize this design, the copious use of experimental'' ''illustrations was necessary. The apparatus used in the Lectures, and'' figured in the volume, has been principally built up from Professor Willis's ''most admirable system. In the selection of the subjects, the question of'' practical utility has in many cases been regarded as the one of paramount ''importance. The elementary truths of Mechanics are too well known to'' admit of novelty, but it is believed that the mode of treatment which is ''adopted is more or less original. This is especially the case in the Lectures'' relating to friction, to the mechanical powers, to the strength of timber and ''structures, to the laws of motion, and to the pendulum. The illustrations,'' drawn from the apparatus, are nearly all original, and are beautifully executed.