Part III. =Hydrostatics.= 3_s.

_Knowledge._ We cordially recommend Mr Glazebrook's volumes to the notice of teachers.

_Practical Teacher._ We heartily recommend these books to the notice of all science teachers, and especially to the masters of Organised Science Schools, which will soon have to face the question of simple practical work in physics, for which these books will constitute an admirable introduction if not a complete _vade mecum_.

=Heat and Light.= An Elementary Text-book, Theoretical and Practical, for Colleges and Schools. By R. T. Glazebrook, M.A., F.R.S. Crown 8vo. 5_s._ The two parts are also published separately.

=Heat.= 3_s._ =Light.= 3_s._

_Journal of Education._ We have no hesitation in recommending this book to the notice of teachers.

_Practical Photographer._ Mr Glazebrook's text-book on "Light" cannot be too highly recommended.

GEOLOGICAL SERIES.

=Handbook to the Geology of Cambridgeshire.= For the use of Students. By F. R. Cowper Reed, M.A., F.G.S., Assistant to the Woodwardian Professor of Geology. With Illustrations. Crown 8vo. 7_s._ 6_d._

_Nature._ The geology of Cambridgeshire possesses a special interest for many students.... There is much in Cambridgeshire geology to arouse interest when once an enthusiasm for the science has been kindled, and there was need of a concise hand-book which should clearly describe and explain the leading facts that have been made known.... The present work is a model of what a county geology should be.

=The Principles of Stratigraphical Geology.= By J. E. Marr, M.A., Fellow of St John's College, Cambridge. Crown 8vo. 6_s._

_Nature._ The work will prove exceedingly useful to the advanced student; it is full of hints and references, gathered during the author's long experience as a teacher and observer, and which will be valuable to all who seek to interpret the history of our stratified formations.

_University Extension Journal._ Mr Marr is an old University Extension lecturer, and his book, which is distinguished by the lucidity and thoroughness which characterise all his work, cannot fail to be of service to University Extension students who are making a serious study of Geology.

=Crystallography.= By W. J. Lewis, M.A., Professor of Mineralogy in the University of Cambridge. Demy 8vo. 14_s._ net.

_Athenæum._ Prof. Lewis has written a valuable work.... The present work deserves to be welcomed not only as a greatly needed help to advanced students of mineralogy, but as a sign that the study itself maintains an honoured place in the university Science Course.

_Nature._ The author and the University Press may be congratulated on the completion of a treatise worthy of the subject and of the University.

=Petrology for Students.= An Introduction to the Study of Rocks under the Microscope. By A. Harker, M.A., F.G.S., Fellow of St John's College, and Demonstrator in Geology (Petrology) in the University of Cambridge. Crown 8vo. Second Edition, Revised. 7_s._ 6_d._

_Nature._ No better introduction to the study of petrology could be desired than is afforded by Mr Harker's volume.

London: C. J. CLAY AND SONS, CAMBRIDGE UNIVERSITY PRESS WAREHOUSE, AVE MARIA LANE AND H. K. LEWIS, 136, GOWER STREET, W.C. _Medical Publisher and Bookseller._

Transcriber's Note

Any obsolete or alternate spelling and grammar was retained. All obvious typographical errors were corrected. Although hyphenation of words has been standardized to the most prevalent occurrence, the six occurrences of fresh-water were not converted to freshwater (30 occurrences) due to usage. Corrected spellings: Godwin-Austen (p. 20); Whidbourne (p. 191); and Ichthyopterygia (p. 223).