.,

THE LAWS OF THOUGHT, on which are founded the Mathematical Theories of
Logic and Probabilities. By GEORGE BOOLE, Professor of Mathematics in
Queen's College, Cork.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

Just published, fcp. 8vo., 1s. 9d.,

EUCLID EXPLAINED.--The First Book of Euclid Explained to Beginners. By
C. P. MASON, B.A., Fellow of University College, and Principal of Denmark
Hill Grammar School.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

YOUNG MEN'S CHRISTIAN ASSOCIATION.

Just published, crown 8vo., 1s. sewed, 1s. 6d. cloth,

BUSINESS AS IT IS AND AS IT MIGHT BE. By JOSEPH LYNDALL.

This work obtained the prize of fifty guineas offered by the Young Men's
Christian Association for the best Essay on the Evils of the Present System
of Business, and the Difficulties they present to the Attainment and
Development of Personal Piety, with Suggestions for their Removal.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

Second Edition, 500 Woodcuts, 2l. 2s.,

DR. WM. SMITH'S DICTIONARY OF GREEK AND ROMAN ANTIQUITIES. By various
Writers. Medium 8vo.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

500 Woodcuts, 3 vols. medium 8vo., 5l. 15s. 6d.,

DR. WM. SMITH'S DICTIONARY OF GREEK AND ROMAN BIOGRAPHY AND MYTHOLOGY. By
various Writers.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

MR. QUAIN'S NEW WORK.

Now ready, crown 8vo., with coloured Plates, 7s. 6d., cloth,

DISEASES OF THE RECTUM. By RICHARD QUAIN, F.R.S., Professor of Clinical
Surgery in University College, and Surgeon to University College Hospital.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster
Row.

* * * * *

COMPLETION OF THE FIRST VOLUME OF DR. SMITH'S DICTIONARY OF GEOGRAPHY.

Just completed, Volume I., price 1l. 16s., cloth, lettered,

A DICTIONARY OF GREEK AND ROMAN GEOGRAPHY. By Various Writers. Edited by
DR. WILLIAM SMITH. Illustrated by numerous Engravings on Wood. To form two
volumes. 8vo.

London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane; and JOHN
MURRAY, Albemarle Str