Considerations on the Necessity of Restoring the Chant of the Church of Rome in All Churches of the Empire

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tions related to longitude and latitude, 1 vol. in-4º. Price, . . . . 9 f.
The Appendix which concludes this work contains, 1º the method for determining longitudes on land by means of longitude watches composed by the Author; 2º instruction on the manner in which an artist must proceed to disassemble, clean, and reassemble a marine clock, verify its rate, etc.

7º. On the measurement of time, or supplement to the Treatise on Marine Clocks and the Essay on Horology, containing the principles of construction, execution, and testing of small clocks for astronomical longitudes, etc., eleven copperplate engravings. Price, . . . . 18 fr.

8º Treatise on Longitude Watches, containing the description and all the workmanship details of these machines, their dimensions, the manner of testing them, etc., followed 1º by the informative memoir on the work of clocks and longitude watches; 2º by the description of two astronomical clocks; 3º by the essay on a simple method for maintaining the ratio of weights and measures; and to establish a universal and perpetual measure, with seven copperplate engravings, vol. in-4º.

9º. Continuation of the Treatise on Longitude Watches, containing 1º the construction of vertical portable watches, and those of horizontal clocks, to serve in the longest crossings; 2º the description and tests of small, simpler, and more portable horizontal clocks, with two copperplate engravings. Price of these last two vols., combined in one, . . . . . . . . . . . . . . . 26 fr.

10º. Supplement to the Treatise on Longitude watches, followed by a notice of the Author's research from 1752 until 1807. Price, . . . 9 fr.
Total of this collection, for Paris, . . . 167 fr. 50 c.

BERTIER. Physics of Comets, in-12.
— Principles of Physics, 3 vol. in-12.

BERTRAND. New development of the elementary part of Mathematics; Geneva, 1778, 2 vol. in-4. 33 fr.

BETTINUS. Apiaria universæ philosophiæ Mathematicæ Beekeeping of Universal Mathematical Philosophy, fourth edition, 2 vol. in-folio. Bologna 1645.
— Recreationum mathematicarum Mathematical Recreations, in-folio. 1659.
— Ærarium philosophiæ Mathematicæ Treasury of Mathematical Philosophy, 3 vol. in-4.

BEZOUT. Complete Course of Mathematics for the use of the Navy, Artillery, and Students of the Ecole Polytechnique Polytechnic School, in 7 vol. in-8º., edition revised and augmented by Messrs. Garnier, former professor at the Polytechnic School, instructor, and doctor of the Faculty of Sciences of the Imperial University, and Raynaud, examiner of candidates for the Polytechnic School, and tutor at that School. 31 fr.
Each volume is sold separately, namely:
Arithmetic with very extensive notes, etc., by Reynaud. 5th edit. 3 fr.
— Geometry (See, page 28, under the word REYNAUD.) 5 fr.
Bezout's Algebra, and application of this science to Geometry. New edition revised by Mr. Garnier. in-8. 5 fr.
The Arithmetic is followed by a treatise on the new weights and measures, very extensive additions, and logarithm tables, the likes of which have not yet appeared. The notes to the Algebra and Geometry are increased by more than double.
— Mechanics, 2 vol. in-8. 10 fr.
— Treatise on Navigation, augmented by two tables of logarithms of numbers, and those of sines, cosines, tangents, and cotangents, much more accurate and extensive than the old ones. in-8. 5 fr.