Elementary Class-Books-continued.

LOGIC.

ELEMENTARY LESSONS IN LOGIC; Deductive and Inductive, 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. 3s. 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 drawn 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 which 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 Chromoliths of the Spectra of the Sun, Stars, and Nebulæ. Fifth Thousand. 18mo. 4s. 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 Nebule, forms a frontispiece. The EDUCATIONAL TIMES calls this "the beau ideal of a scientific text-book, clear, accurate, and thorough.”

MANUALS FOR STUDENTS.

Flower (W. H.)-AN INTRODUCTION TO THE OSTEOLOGY 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. 7s. 6d.

Although the present work contains the substance of a Course of Lectures, the form has been changed, so as the better to adapt it as a handbook for students. Theoretical views have been almost entirely excluded: and while 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 absolutely 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 manuals hitherto in use aim at giving. The Ordinal, Generic, and Specif.c characters have been re-written, and are to a great extent original, and drawn from living or dried specimens, or both. "Cannot fail to perfectly 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.

D

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.

Ball (R. S., A.M.)-EXPERIMENTAL MECHANICS. A Course of Lectures delivered at the Royal College of Science for Ireland. 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 the 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 either 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 bractical utility has in many cases been regarded as the one of paramount

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.

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

CHEMICAL PHILOSOPHY.

Ervine Professor of Chemistry and Mineralogy in Harvard College.
Crown 8vo.

I25.

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. 215.

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—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

mirable elementary treatise on the subject, whilst by the insertion in appendices to each lecture of extracts from the most important published memoirs, the author has rendered it equally valuable as a text book for advanced students."-WESTMINSTER REVIEW.

Thorpe (T. E.)—A SERIES OF CHEMICAL PROBLEMS,

for use in Colleges and Schools. Adapted for the preparation of Students for the Government, Science, and Society of Arts Examinations. With a Preface by Professor ROSCOE. 18mo. cloth. IS.

In the Preface Dr. Roscoe says—“ My experience has led me to feel more and more strongly that by no method can accuracy in a knowledge of chemistry be more surely secured than by attention to the working of wellselected problems, and Dr. Thorpe's thorough acquaintance with the wants of the student is a sufficient guarantee that this selection has been carefully made. I intend largely to use these questions in my own classes, and I can confidently recommend them to all teachers and students of the science."

Wurtz.-A HISTORY OF CHEMICAL THEORY, from the Age of Lavoisier down to the present time. By AD. WURtz. Translated by HENRY WATTS, F. R.S. Crown 8vo. 6s.

"The treatment of the subject is admirable, and the translator has evidently done his duty most efficiently."—WESTMINSTER REVIEW. "The discourse, as a résumé of chemical theory and research, unites singular luminousness and grasp. A few judicious notes are added by the translator."-PALL MALL GAZETTE.