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MATHEMATICS AND PHYSICS.
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JACKSON (S.): Commercial Arithmetic. Globe 8vo. $1.10.

LOCK. Works by Rev. J. B. Lock, M.A., Senior Fellow, Assistant Tutor and Lecturer in Gonville and Caius College, Cambridge.

Arithmetic for Beginners. A School Class-book of Commercial Arithmetic. 16mo. 60 cents. Key. $2.25.

LOCK and SCOTT: Arithmetic for Schools. Adapted for Use in American Schools. By Rev. J. B. Lock and Professor Charlotte Angas Scott, Bryn Mawr College. 70 cents.

PEDLEY: Exercises in Arithmetic for the Use of Schools. Containing more than 7000 Original Examples. By S. Pedley. 12mo. $1.25.

PENDLEBURY: Arithmetic. With 8000 Examples. By Charles Pendlebury, M.A., F.R.A.S. With Answers. Fourth Edition, Stereo-typed. $1.10.

SMITH: Arithmetic for Schools. By C. Smith, M.A. $1.00.

SMITH. Works by Barnard Smith, M.A.

Arithmetic for the Use of Schools. New Edition. $1.00.

Key. New Edition. $2.25.

School Class-Book of Arithmetic. $1.00.

Key. $1.50.

Shilling Book of Arithmetic. With Answers. 18mo. 40 cents.

Key. 18mo. $1.10.

Examination Papers in Arithmetic. With Answers. 60 cents.

Key. 18mo. $1.25.

The Metric System of Arithmetic. 18mo. Paper. 8 cents.
THOMAS: Enunciations in Arithmetic, Algebra, Euclid, and Trigonometry, with a Few Examples and Notes. By P. A. Thomas, B.A., Assistant Master in Sedbergh School. Globe 8vo. 60 cents.

ASTRONOMY.

AIRY: Works by Sir G. B. Airy, K.C.B., formerly Astronomer-Royal.
Popular Astronomy. With Illustrations. New Edition. 18mo. $1.10. Gravitation. An Elementary Explanation of the Principal Perturbations in the Solar System. New Edition. 12mo. $1.90.

CHAMBERS: A Handbook of Descriptive and Practical Astronomy. By George F. Chambers, F.R.A.S.

Vol. III. The Sun, Planets, and Comets. 8vo. $5.25.

Vol. III. Instruments and Practical Astronomy. 8vo. $5.25.

Vol. III. The Starry Heavens. (Completing the work.) 8vo. $3.50.

Pictorial Astronomy. By G. F. Chambers. With Numerous Illustrations. $1.25.

CHEYNE: An Elementary Treatise on the Planetary Theory. By the late C. H. H. Cheyne, M.A. Third Edition. Edited by Rev. A. Freeman, M.A. 12mo. $1.75.

CLARK and SADLER: The Star Guide. A List of the most remarkable Celestial Objects visible with small Telescopes, with their Positions for every Tenth Day in the Year, and other Astronomical Information. By Latimer Clark, F.R.A.S., and Herbert Sadler, F.R.A.S. Royal 8vo. $2.50.