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ELEMENTARY CLASS-BOOKS.

importance of Science as an element of sound educa&shy;tion is now generally acknowledged; and accordingly it is obtaining a prominent place in the ordinary course of school instruction. It is the intention of the Publishers to produce a complete series of Scientific Manuals, affording full and accurate elementary information, conveyed in clear and lucid English. The authors are well known as among the foremost men of their several departments; and their names form a ready guarantee for the high character of the books. Subjoined is a list of those Manuals that have already appeared, with a short account of each. Others are in active preparation; and the whole will constitute a standard series specially adapted to the requirements of be&shy;ginners, whether for private study or for school instruction.

This work consists of six lectures, which are intended “to explain to intelligent persons the principles on which the instruments of an Observa&shy;tory are constructed (omitting all details, so far as they are merely sub&shy;sidiary), and the principles on which the observations made with these instruments are treated for deduction of the distances and weights of the bodies of the Solar System, and of a few stars, omitting all minutiœ of