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AN INTRODUCTION TO PRACTICAL ASTRONOMY, or the Use of the Quadrant and Equatorial; selected from the Astronomical, &c. Essays, with 2 Plates, Price 3s.

ESSAYS ON THE MICROSCOPE, containing a particular Description of the most improved Microscopes; a general History. of Insects; a Description of 379 Animalcula; a View of the Organization of Timber, and the Configurations of Salts when under the Microscope, &c. &c. Second Edition, by FREDERIC KANMACHER, in 4to, and illustrated by 33 Plates. Price 1. 16s. in boards. Reprinting by W. & S. Jones.

AN ESSAY ON ELECTRICITY, explaining clearly and fully the Principles of that curious and useful Science, 8vo. in Boards. AN ESSAY ON VISION, Third Edition, 8vo. in Boards.

GEOMETRICAL AND GRAPHICAL
ESSAYS.

Containing a general Description of the best and most approved
MATHEMATICAL INSTRUMENTS, in Geometry, Civil and Military
Surveying, Levelling, Perspective, Gunnery, &c. with many new
practical Problems, illustrated by 34 Copper-plates. By the late
GEORGE ADAMS, with Corrections and Improvements. By WIL
LIAM JONES, F. Am. P. S. Fourth Edition, 8vo.

LECTURES

IN

NATURAL AND EXPERIMENTAL

PHILOSOPHY.

In 5 vols. 8vo. the fifth Volume consisting of the Plates and Index, revised and corrected by the above Editor. Reprinting.

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Glendinning, Printer, 25, Hatton Garden, London.

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