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32. MATHEMATICAL INSTRUMENTS, a Treatise on; in which their Construction and the Methods of Testing, Adjusting, and Using them are concisely Explained. By J. F. Heather, M.A., of the Royal Military Academy, Woolwich. Original Edition, in 1 vol., Illustrated, is. 6d. *** In ordering the above, be careful to say, " Original Edition " (No. 32), to distinguish it from the Enlarged Edition in 3 vols. (Nos. 168-9-70.)

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61*. READY RECKONER FOR THE ADMEASUREMENT 0F LAND. By Abraham Arman, Schoolmaster, Thurleigh, Beds. To which is added a Table, showing the Price of Work, from 2s. 6d. to £1 per acre, and Tables for the Valuation of Land, from Is. to £1,000 per acre, and from one pole to two thousand acres in extent, etc, etc. Is. 6d.

76. DESCRIPTIVE GEOMETR Y, an Elementary Treatise on; with a Theory of Shadows and of Perspective, extracted from the French of G. Monge. To which is added, a description of the Principles and Practice of Isometrical Projection ; the whole being intended as an introduction to the Application of Descriptive Geometry to various branches of the Arts. By J. F. Heather, M.A. Illustrated with 14 Plates. 2s.

178. PRACTICAL PLANE GEOMETRY: giving the Simplest

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179. PROfECTION: Orthographic, Topographic, and Perspective: giving the various Modes of Delineating Solid Forms by Constructions on a Single Plane Surface. By J. F. Heather, M.A. [In preparation.

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90. ANALYTICAL GEOMETRY AND CONIC SECTIONS, a Rudimentary Treatise on. By James Hann, late Mathematical Master of King's College School, London. A New Edition, re-written and enlarged by J. R. Young, formerly Professor of Mathematics at Belfast College. 2s.#

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102. INTEGRAL CALCULUS, Rudimentary Treatise on the. By

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168. DRAWING AND MEASURING INSTRUMENTS. Including - I. Instruments employed in Geometrical and Mechanical Drawing, and in the Construction, Copying, and Measurement of Maps and Plans. II. Instruments used for the purposes of Accurate Measurement, and for Arithmetical Computations. By J. F. Heather, M.A., late of the Royal Military Academy, Woolwich, Author of " Descriptive Geometry," etc, etc. Illustrated, Is. 6d.

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170. SURVEYING AND ASTRONOMICAL INSTRUMENTS.

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168. MATHEMATICAL INSTRUMENTS. By J. F. Heather,

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158. THE SLIDE RULE, AND HOW TO USE IT; containing full, easy, and simple Instructions to perform all Business Calculations with unexampled rapidity and accuracy. By Charles Hoare, C.E. With a Slide Rule in tuck of cover. 2s. 6d.#

185. THE COMPLETE MEASURER ; setting forth the Measure-ment of Boards, Glass, etc, etc.; Unequal-sided, Square-sided, Octagonal-sided, Round Timber and Stone, and Standing Timber. With a Table showing the solidity of hewn or eight-sided timber, or of any octagonal-sided column. Compiled for Timber-growers, Merchants, and Surveyors, Stonemasons, Architects, and others. By Richard Horton. Fourth Edition, with valuable additions. 4s.; strongly bound in leather, 5s.

196. THEORY OF COMPOUND INTEREST AND ANNUL TIES; with Tables of Logarithms for the more Difficult Computations of Interest, Discount, Annuities, etc. By Fe"dor Thoman. 4s.#

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199. INTUITIVE CALCULATIONS; or, Easy and Compendious

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221. MEASURES, WEIGHTS, AND MONEYS OF ALL NATIONS, and an Analysis of the Christian, Hebrew, and Mahometan Calendars. By W. S. B. Woolhouse, F.R.A.S., F.S.S. Sixth Edition, carefully revised and enlarged. 2s #

227. MATHEMATICS AS APPLIED TO THE CONSTRUC-

T1VE ARTS. Illustrating the various processes of Mathematical Investigation, by means of Arithmetical and Simple Algebraical Equations and Practical Examples; also the Methods of Analysing Principles and Deducing Rules and Formulae, applicable to the Requirements of Practice. By Francis Campin, C.E., Author of "Materials and Construction," etc. Second Edition, revised and enlarged by the Author. 3s. # [Just published.

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