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SCIENCE.

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Elementary Class-Bookscontinued.

CHEMISTRY.

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PROFESSOR ROSCOE'S LESSONS IN ELEMENTARY
CHEMISTRY, INORGANIC AND ORGANIC. By HENRY
E. Roscoe, F.R.S., Professor of Chemistry in Owens College,
Manchester. With numerous Illustrations and Chromo-Litho. of
the Solar Spectrum, and of the Alkalies and Alkaline Earths,

New Edition. Twenty-ninth Thousand. 18mo. cloth. 45. 6d. It has been the endeavour of the author to arrange the most important facts and principles of Modern Chemistry in a plain but concise and scientific form, suited to the present requirements of elementary instruction. For the purpose of facilitating the attainment of exactitude in the knowledge of the subject, a series of exercises and questions upon the lessons have been added. The metric system of weights and measures, and the centigrade thermometric scale, are used throughout the work. The new Edition, besides new wood-cuts, contains many additions and improvements, and includes the most important of the latest discoveries. As a standard general text-book it deserves to take a leading place.—SPECTATOR. unhesitatingly pronounce it the best of all our elementary treatises on Chemistry.—MEDICAL TIMES.

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POLITICAL ECONOMY.

POLITICAL ECONOMY FOR BEGINNERS. By MILLICENT
G. FAWCETT. 18mo.

25. 6d.

The following pages have been written mainly with the hope that a short and elementary book might help to make Political Economy a more popular study in boys' and girls' schools. In order to adapt the book especially for school use, questions have been added at the end of each chapter. compact, and comprehensive.—Daily News. The relations of capital and labour have never been more simply or more clearly expounded. CONTEMPORARY REVIEW.

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EDUCATIONAL BOOKS.

Elementary Class-Books-continued.
LOGIC.

ELEMENTARY LESSONS IN LOGIC; Deductive and Induc-
tive, with copious Questions and Examples, and a Vocabulary of
Logical Terms. By W. STANLEY JEVONS, M. A., Professor of Logic

in Owens College, Manchester. Second Edition. 18mo. 35. 6d. In preparing these Lessons the author has attempted to show that Logic, even in its traditional form, can be made a highly useful subject of study, and a powerful means of mental exercise. With this view he has avoided the use of superfluous technical terms, and has abstained from entering into questions of a purely speculative or metaphysical character. For the puerile illustrations too often found in works on Logic, examples dz. wn from the distinct objects and ideas treated in the natural and experimental sciences have been generally substituted. At the end of almost every

Lesson will be found references to the works in wnich the student will most profitably continue his reading of the subject treated, so that this little volume may serve as a guide to a more extended course of study. The GUARDIAN thinks nothing can be better for a school-book,and the ATHENÆUM calls it" a manual alike simple, interesting, and scientific." PHYSICS.

LESSONS IN ELEMENTARY PHYSICS. By BALFOUR
STEWART, F.R.S., Professor of Natural Philosophy in Owens
College, Manchester. With numerous Illustrations and Chromo-
liths of the Spectra of the Sun, Stars, and Nebulæ. Fifth Thou.

sand. 18mo. 45. 6d. A description, in an elementary manner, of the most important of those laws which regulate the phenomena of nature. The active agents, heat, light, electricity, etc., are regarded as varieties of energy, and the work is so arranged that their relation to one another, looked at in this light, and the paramount importance of the laws of energy are clearly brought out. The volume contains all the necessary illustrations, and a plate representing the Spectra of Sun, Stars, and Nebulæ, forms a frontispiece. The EDUCATIONAL Times calls this the beau ideal of a scientific text-book, clear, accurate, and thorough.

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Flower (W. H.)—AN INTRODUCTION TO THE OSTE

OLOGY OF THE MAMMALIA. Being the substance of the Course of Lectures delivered at the Royal College of Surgeons of England in 1870. By W. H. FLOWER, F.R.S., F.R.C.S., Hunterian Professor of Comparative Anatomy and Physiology. With numerous Illustrations. Globe 8vo. 75. 6d.

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hrush the present work contains the substance of a Course of Lcctures, the form hos been changed, so as the better to adapt it as a handbook forstudents. Theoretical views have been almost entirely excluded : and white it is impossible in a scientific treatise to avoid the employment of technical terms, it has been the author's endeavour to use no more than absolutoi'r necessary, and to exercise due care in selecting only those that seem most appropriate, or which have received the sanction of general adoption. With a very few exceptions the illustrations have been drawn expressly for this work

from specimens in the Museum of the Roval College of Surgeons.

Hooker (Dr.)—THE STUDENT'S FLORA OF THE

BRITISH ISLANDS. By J. D. HOOKER, C.B., F.R.S., M.D., D.C.L., Director of the Royal Gardens, Kew. Globe 8vo.

Ios. 6d.

The object of this work is to supply students and field-botanists with a fuller account of the Plants of the British Islands than the manuais hitherto in use aim at giving. The Ordinal, Generic, and Specific characters have been re-written, and are to a great extent original, anil drawn from living or dried specimens, or both. Cannot fail to perfecti y fulfil the purpose for which it is intended.—LAND AND WATER.

Containing the fullest and most accurate manual of the kind that has yet appeared.—PALL MALL GAZETTE.

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EDUCATIONAL BOOKS.

Oliver (Professor).—FIRST BOOK OF INDIAN BOTANY.

By DANIEL OLIVER, F.R.S., F.L.S., Keeper of the Herbarium and Library of the Royal Gardens, Kew, and Professor of Botany in University College, London. With numerous Illustrations.

Extra fcap. 8vo. 6s. 6d. This manual is, in substance, the author's Lessons in Elementary Botany,adapted for use in India. In preparing it he has had in view the want, often felt, of some handy résumé of Indian Botany, which might be serviceable not only to residents of India, but also to any one about to proceed thither, desirous of getting some preliminary idea of the Botany of that country.

It contains a well-digested summary of all essential knowledge pertaining to Indian botany, wrought out in accordance with the best principles of scientific arrangement.ALLEN'S INDIAN MAIL.

Other volumes of these Manuals will follow.

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Ball (R. S., A.M.)—EXPERIMENTAL MECHANICS.

A Course of Lectures delivered at the Royal College of Science
for [reland. By ROBERT STAWELL Ball, A.M., Professor of
Applied Mathematics and Mechanics in the Royal College of
Science for Ireland (Science and Art Department). Royal 8vo.

16s. These twenty Lectures, delivered by the author in the spring of 1870, have in che present volume been revised, and some of them rewritten. His aim has been to create in the mind of the student physical ideas corresponding to theoretical laws, and thus to produce a work which may be regarded cither as a supplement or an introduction to manuals of theoretic mechanics. To realize this design, the copious use of experimental illustrations was necessary. The apparatus used in the Lectures, and figured in the volume, has been principally built up from Professor Willis's most admirable system. In the selection of the subjects, the question of trectical utility has in many cases been regarded as the one of paramount

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importance. The elementary truths of Mechanics are too well known to admit of novelty, but it is believed that the mode of treatment which is adopted is more or less original. This is especially the case in the Lectures relating to friction, to the mechanical powers, to the strength of timber and structures, to the laws of motion, and to the pendulum. The illustrations, drawn from the apparatus, are nearly all original, and are beautifully executed.

I2s.

Cooke (Josiah P., Jun.).- FIRST PRINCIPLES OF

CHEMICAL PHILOSOPHY. By Josiah P. COOKE, Jun.,
Ervine Professor of Chemistry and Mineralogy in Harvard College.

Crown 8vo. The object of the author in this book is to present the philosophy of Chemistry in such a form that it can be made with profit the subject of College recitations, and furnish the teacher with the means of testing the student's faithfulness and ability. With this view the subject has been developed in a logical order, and the principles of the science are taught independently of the experimental evidence on which they rest.

Roscoe (H. E.)-SPECTRUM ANALYSIS. Six Lectures,

with Appendices, Engravings, Maps, and Chromolithographs. By H. E. Roscoe, F.R.S., Professor of Chemistry in Owens College, Manchester. Royal 8vo.

21S. A Second Edition of these popular Lectures, containing all the most recent discoveries and several additional Illustrations. In six lectures he has given the history of the discovery and set forth the facts relating to the analysis of light in such a way that any reader of ordinary intelligence and information will be able to understand what Spectrum Analysis' is, and what are its claims to rank among the most signal triumphs of science of which even this century can boast.—NONCONFORMIST. “ The illustrations

s-no unimportant part of a book on such a subject-are marvels of wood-printing, and reflect the clearness which is the distinguishing merit of Mr. Roscoe's explanations.". SATURDAY REVIEW. The lectures themselves furnish a most ad

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