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CLASSIC VERSIONS OF ENGLISH BOOKS,

AND LATIN HYMNS.

THE following works are, as the heading indicates, classic renderings of English books. For scholars, and particularly for writers of Latin Verse, the series has a special value. The Hymni Ecclesiæ are here inserted, as partly falling under the same class.

Church (A. J., A.M.)-HORÆ TENNYSONIANÆ, sive

Eclogae e Tennysono. Latine redditæ. Cura A. J. CHURCH,

A.M. Extra fcap. 8vo. 6s. Latin versions of Selections from Tennyson. Among the authors are the Editor, the late Professor Conington, Professor Seeley, Dr. Hessey, Mr. Kebbel, and other gentlemen.

Latham.-SERTUM SHAKSPERIANUM, Subnexis aliquot

aliunde excerptis floribus. Latine reddidit Rev. H. LATHAM, M.A.

Extra fcap. 8vo. 55. Besides versions of Shakspeare this volume contains, among other pieces, Gray's Elegy,Campbell's Hohenlinden,Wolfe's Burial of Sir John Moore," and selections from Cowper and George Herbert.

Lyttelton.—THE COMUS OF MILTON, rendered into Greek

Verse. By LORD LYTTELTON. Extra fcap. 8vo. 5s.

Lyttelton-continued.
THE SAMSON AGONISTES OF MILTON, rendered into Greek

Verse. By LORD LYTTELTON. Extra fcap. 8vo. 6s. 6d.

Merivale.-KEATS HYPERION, rendered into Latin Verse.

By C. MERIVALE, B.D. Second Edit. Extra fcap. 8vo. 35. 6d.

Newman.- HYMNI ECCLESIÆ. Edited by Rev. Dr.

NEWMAN. Extra fcap. 8vo. 75. 6d. Hymns of the Medieval Church. The first Part contains selections from the Parisian Breviary; the second from those of Rome, Salisbury, and York.

Trench (Archbishop). SACRED LATIN POETRY

chiefly Lyrical, selected and arranged for Use ; with Notes and

Introduction. Fcap. 8vo. 7s. In this work the editor has selected hymns of a catholic religious sentiment that are common to Christendom; while rejecting those of a distinctively Romish character.

MATHEMATICS.

Airy.-Works by G. B. AIRY, Astronomer Royal :

ELEMENTARY TREATISE ON PARTIAL DIFFERENTIAL

EQUATIONS. Designed for the Use of Students in the Univer.

sities. With Diagrams. Crown 8vo. cloth. 55. 6d. It is hoped that the methods of solution here explained, and the instances exhibited, will be found sufficient for application to nearly all the important problems of Physical Science, which require for their complete investigation the aid of Partial Differer.tial Equations.

ON THE ALGEBRAICAL AND NUMERICAL THEORY OF

ERRORS OF OBSERVATIONS AND THE COMBINA.
TION OF OBSERVATIONS. Crown 8vo. cloth. 6s. ód.

In order to spare astronomers and observers in natural philosophy the confusion and loss of time which are produced by referring to the ordinary treatises embracing both branches of probabilities (the first relating to chances which can be altered only by the changes of entire units or in. tegral multiples of units in the fundamental conditions of the problem ; the other concerning those chances which have respect to insensible gradations in the value of the element measured), the present tract has been drawn

up. It relates only to errors of observation, and to the rules, derivable i from the consideration of these errors, for the combination of the results

of observations,

B

Airy (G. B.).—continued.
UNDULATORY THEORY OF OPTICS. Designed for the Use of

Students in the University. New Edition. Crown 8vo. cloth.
6s. 6d.

The undulatory theory of optics is presented to the reader as having the same claims to his attention as the theory of gravitation : namely, that it is certainly true, and that, by mathematical operations of general elegance, it leads to results of great interest. This theory explains with accuracy a vast variety of phenomena of the most complicated kind. The plan of this tract has been to include those phenomena only which admit of calculation, and the investigations are applied only to phenomena which actually have been observed.

ON SOUND AND ATMOSPHERIC VIBRATIONS. With the

Mathematical Elements of Music. Designed for the Use of Students of the University. Second Edition, Revised and Enlarged.

Crown 8vo. 9s. This volume consists of sections, which again are divided into numberia articles, on the following topics : General recognition of the air as the medium which conveys sound; Properties of the air on which the forma. tion and transmission of sound depend ; Theory of undulations as applied to sound, &c. ; Investigation of the motion of a wave of air through the atmosphere ; Transmission of waves of soniferous vibrations through different gases, solids, and fluids ; Experiments on the velocity of sound, &c.; On musical sound's, and the manner of producing them; On the elements of musical harmony and melody, and of simple musical composition ; On instrumental music; On the human organs of speech and hearing

A TREATISE ON MAGNETISM. Designed for the use of

Students in the University. Crown 8vo. gs. 6d. As the laws of Magnetic Force have been experimentally examined with philosophical accuracy, only in its connection with iron and steel, and in

the influences excited by the earth as a whole, the accurate portions of this work are confined to the investigations connected with these metals and the earth. The latter part of the work, however, treats in a more general way of the laws of the connection between Magnetisin on the one hand and galvanism and thermo-electricity on the other. The work is divided into Twelve Sections, and each section into numbered articles, each of which states concisely and clearly the subject of the following paragraphs.

Airy (Osmund.) A TREATISE ON GEOMETRICAL

OPTICS. Adapted for the use of the Higher Classes in Schools.
By OSMUND AIRY, B.A., one of the Mathematical Masters in
Wellington College. Extra fcap. 8vo. 35. 6d.

This is, I imagine, the first time that any attempt has been made to adapt the subject of Geometrical Optics to the reading of the higher classes in our good schools. Thai this should be so is the more a matter for remark, since the subject would appear to be peculiarly fiited for such an adaptation. I have endeavoured, as much as possible, to avoid the example of those popular lecturers who explain difficulties by ignoring them. Brit as the nature of my design necessitated brevity, I have omitted entirely one or two portions of the subject which I considered unnecessary to a clear understanding of the rest, and which appear to me better learnt at a more advanced stage.—AUTHOR'S PREFACE. This book," the ATHENÆUM says, is carefully and lucidly written, and rendered as simple as possible by the use in all cases of the most elementary form of investigation.

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Bayma.—THE ELEMENTS OF MOLECULAR MECHA.

NICS. By JOSEPH BAYMA, S. J., Professor of Philosophy,

Stonyhurst College. Demy 8vo. cloth. Of the twelve Books into which the present treatise is divided, the first and second give the demonstration of the principles which bear directly on the constitution and the properties of matter. The next three books contain a series of theorems and of problems on the laws of motion of elementary substances. In the sixth and seventh, the mechanical constitution of molecules is investigated and determined : and by it the general properties of bodies are explained. The eighth book treats of luminiferous æther. The

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