TRIGONOMETRÍA.

BEASLEY: An Elementary Treatise on Plane Trigonometry. With Examples. By R. D. Beasley, M.A. Ninth Edition, Revised and Enlarged. 12mo. 90 cents.

BOTTOMLEY: Four-Figure Mathematical Tables. Comprising Logarithmic and Trigonometrical Tables, and Tables of Squares, Square Roots, and Reciprocals. By J. T. Bottomley, M.A., F.R.G.S., F.C.S. 8vo. 70 cents.

DYER y WHITCOMBE: Trigonometry, The Elements of. Por J. M. Dyer, M.A., y el Rev. H. R. Whitcombe, M.A. $1.25.

HALL y KNIGHT: Elementary Trigonometry. By H. S. Hall, M.A., and S. R. Knight, B.A., M.B., Ch.B. 16mo. $1.10.

HAYWARD: The Algebra of Co-Planar Vectors and Trigonometry. By R. B. Hayward, M.A., F.R.S. $2.00.

HOBSON: Treatise on Plane Trigonometry. Por E. W. Hobson. 8vo. $3.00.

Elementary Treatise on Plane Trigonometry for the Use of Schools. Por E. W. Hobson,