MICROSCOPY. The Construction, Theory, and Use of the Microscope. By Edmund J. Spitta, F.R.A.S., F.R.M.S., etc. With numerous Diagrams and Illustrations. Second Edition. 12s. 6d. net.

"Let us hasten to urge every student of the microscope who wishes to gain a thorough understanding of its principles and possibilities and its defects, and every user of the instrument who desires a work of reference to which he may turn for an explanation of some unexplained optical phenomenon, or for particulars of up-to-date apparatus, to procure a copy of Mr Spitta's book without delay."--Nature.

CONVERGENCE IN EVOLUTION. By Arthur Willey, D.Sc. (Lond.); Hon. M.A. (Cantab.); F.R.S. With Diagrams. Demy 8vo. 7s. 6d. net.

This work brings together some scattered facts of parallel development of outward form and internal structure in the Animal kingdom, introducing new cases and fresh interpretations. It is, taken as a whole, an original contribution to the theory of organic evolution, with special reference to the forms of Animal life.

THE HEREDITY OF ACQUIRED CHARACTERS IN PLANTS. An aspect of the true Darwinism based on Personal Observations and Experiments. By the Rev. Prof. George Henslow. With Illustrations. Demy 8vo. 6s. net.

A HANDBOOK OF PHYSIOLOGY. By W.D. Halliburton, M.D., F.R.S., Professor of Physiology, King's College, London. Eleventh Edition, being the Twenty-fourth of Kirkes'. With nearly Seven Hundred Illustrations, including some Coloured Plates. Large Crown 8vo. 15s. net.

"One of the best manuals for the student which we possess ... the book is an eminently trustworthy one, and will prove a valuable foundation for, and introduction to, the large treatises on physiology."—Lancet.

THE BACTERIOLOGY OF MILK. By Harold Swithinbank, of the Bacteriological Research Laboratory, Durham, and Sir George Newman, M.D., F.R.S.E., D.P.H., Chief Medical Officer, Board of Education. With Special Chapters also by Dr Newman on Spread of Disease by Milk and the Control of the Milk Supply. With numerous Illustrations. Royal 8vo. 25s. net.

"Ought to find a place in the library of every medical officer of health and of every milk-producer. Scientific in method and lucid in exposition, the authors have given us a really invaluable text-book."—Spectator.

BACTERIOLOGY AND THE PUBLIC HEALTH. By Sir George Newman, M.D., F.R.S. (Edin.), D.P.H., Chief Medical Officer, Board of Education. With Illustrations. Medium 8vo. 21s. net.