and also the question of the significance of water divining, hypnotism, and allied phenomena on the assumption of Mrs. Atwood's theory.

NOTICES OF BOOKS.

By W. M. London:

Qualitative and Volumetric Analysis. HOOTON, M.A. (Oxon.), M.Sc., F.I.C. Edward Arnold. 1915. THIS book gives first an ordinary course of work in qualitative analysis, beginning with dry tests, then passing on to the metals in solution and the acid radicles, and finally giving separation tables. Although the directions are concise and the matter is well arranged there appears to be no particular novelty in the treatment. A good feature is the inclusion of the rarer metallic ions, such as tung. sten, vanadium, &c., which are of considerable technical importance, and the reactions of the less common acid radicles as well as some organic acids are also tabulated. The principles of volumetric analysis are clearly explained, and a good selection of examples and additional exercises is provided.

Quantitative Law in Biological Chemistry. By SVANTE ARRHENIUS, Ph.D., M.D., LL.D., F.R.S. London : G. Bell and Sons, Ltd. 1915.

THIS book is based upon three Tyndall Lectures, delivered by the author at the Royal Institution in May last year. It contains descriptions of the author's pioneering work on quantitative measurements in biochemitry, with discussions of the conclusions to be drawn from it and the experiments of other investigators in the same sphere. Velocity of Reactions, the Influence of Temperature on the Velocity of Reactions, Reactions of Cells, Quantitative Laws of Digestion and Resorption, Chemical Equilibria and Immunisation are the titles of the chapters, and the book may be said to treat of vitalism from the chemical standpoint and to discuss the applicability of the physico-chemical laws of general chemistry to biochemical processes. The methods and theories of physical chemistry are of very great importance for the develop. ment of an exact science of biochemisty, and this book contains an excellent summary of the work that has already been done, and should prove both interesting and stimulating to students of the science.

John Dalton's Lectures and Lecture Illustrations. Parts I. and II., by Prof. W. W. HALDANE GEE, B.Sc., M.Sc.Tech. Part III, by HUBERT FRANK COWARD, D.Sc., and ARTHUR HARDEN, D.Sc., Ph.D., F.R.S. Manchester 36, George Street. 1915. THESE extracts from the memoirs of the Manchester Literary and Philosophical Society contain descriptions of some diagrams made and used by John Dalton, which were found in a cupboard in the house of the Society. The diagrams, after they had been examined by experts, were cleaned and repaired, and this catalogue of them was prepared. In all they number about 150, and they were divided into two groups; firstly, those relating to Mechanics, Physics, Astronomy, and Meteorology, and secondly those dealing with the Atomic Theory. These latter, which are described in Part III. of the pamphlet, are particularly interesting. Short summaries of some of the lectures are included, prepared from lecture notes and syllabuses of courses of lectures, which were found among the Dalton manuscripts and miscellaneous packets of papers.

Literary Intelligence.-Messrs. J. and A. Churchill announce the publication of the following new books :"An Introduction to the Physics and Chemistry of Colloids," by Emil Hatschek; Second Edition, with 17 illustrations; price 38. net. "Catalysis and its Industrial Applications," by E. Jobling, A.R.C.Sc., B.Sc., F.C.S.; with 12 illustrations; 2s. 6d. net.

CORRESPONDENCE.

PREPARATION OF SULPHURETTED HYDROGEN.

To the Editor of the Chemical News.

SIR,-The following description of a simple apparatus for the preparation of sulphuretted hydrogen and similar gases, which I devised after much trouble with Kipp's and other forms may be of use to your readers.

An efficient and easily cleaned apparatus for the preparation of sulphuretted hydrogen and similar gases may be made by using for the generating chamber a calcium chloride drying tower. In the constricted part near the bottom is placed a short piece of glass rod of nearly the same diameter and with a flattened head just large enough

to prevent it falling through. In the head channels are cut with a file or pressed while hot. This support permits the use of iron sulphide in small pieces, with which the tower is nearly filled. Acid is admitted through the tubulure, easily enters the generating chamber, and, meeting with a large surface of sulphide, quickly produces a copious current of gas, which, having very little space to fill in the tower, is at once available for use.-I am, &c., Chemical Laboratory, Leeds Forge, Leeds, October 31, 1915.

HAROLD ELLIS

MEETINGS FOR THE WEEK.

WEDNESDAY, 24th.-Royal Society of Arts, 4.30.
THURSDAY,

"Constantinople,
Ancient and Modern," by Sir Edwir Pears.
25th.-Royal Society. "Measurement of the Rate of Heat
Loss at Body Temperature by Convection, Radia-
tion and Evaporation," by M. Flack, O. W.
Griffith. and L. Hill. "Rate of Absorption of
various Phenolic Solutions of Seeds of Hordeum
vulgare and the Factors governing the Rate of
Diffusion of Aqueous Solutions across Semi-
perme ble Membranes," by A. J. Brown. "The
Controlling Influence of Carbon Dioxide-Part
III., The Retarding Effect of Carbon Dioxide on
Respiration," by F. Kidd. "Growth of the Body
in Man-The Rel tionship between the Body
Weight and the Body Length (Stem Length,)" by
E. W. A. Walker.

lehim tab

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The Owners of

The Owners of BRITISH

PATENTS

Nos. 27,244 of 1911, and 17,148 of 1914, relating to "Improvements in the Process for Splitting Fats and Fatty Oils into G ycerine and Fatty Acids," are desirous of disposing of the Patents or entering into working arrangements, under Licence or otherwise, with firms likely to be interested in the same.

Copies of the Patent Specifications and full particulart can be obtained from, and offers (for transmission to the Owners) made to, MARKS and CLERK, 57 & 58, Lincoln's Inn Fields, London, W.C.

HENRY DREYFUS, Doctor of Philosophy, of 69, Schützenmattstrasse, Basle, Switzerland, Chemist, seeks leave to Amend the Specification of Letters Patent No. 20977 of 1911 granted to him for "Process for Making Derivatives of Cellulose and the Products of their Transformation."

Nov. 26, 1915

For general quantitative and qualitative work use:-
WHATMAN No. 1. Retains Barium Sulphate. Ash
weight in grammes of a circle 11 cms. diam. is '0011.
WHATMAN No. 2. About 50 per cent. heavier than
No.1, and similar in its general characteristics.
WHATMAN No. 3. Heavier still. Specially suitable
for pressure and vacuum filters.

WHATMAN No. 4. Very soft, and open in texture;
gives clear filtrates with great rapidity.

WHATMAN No. 5. Close in texture, hard and strong.
Will retain freshly precipitated Lead Sulphate.

Packed in sealed boxes of 100 circles with distinctive labels.
Samples free from your usual Dealer.

SOLE REPRESENTATIVES:

H. REEVE ANGEL & CO., 15 NEW BRIDGE ST., LONDON, E.C.

MICA.

Telephone No. 2248 Avenue.

W. TEMPLE FRANKS,

Comptroller-General.

MEWBURN, ELLIS, and PRYOR, 70 & 72, Chancery Lane, I ondon, W,C, Chartered Patent Agents and Consulting Engineers.

JUST PUBLISHED. In Crown 8vo. Handsome Cloth. Pp. i-xviii. +337. 101 6d. net. VOLUME VIII. OF

A TEXT-BOOK OF INORGANIC CHEMISTRY. EDITED BY J. NEWTON FRIEND, D.Sc., Ph.D.

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