Taken with a Bertrand refractometer.

Solubility of the Oils in 80 Per Cent. Alcohol at 22°.

Oil of nigella not perfectly clear in 23 parts of alcohol by volume.

Oil of boldo leaves soluble in I or even less volumes.

Oil of matico soluble in 32 to 4 parts by volume.

Oil of cascarilla, solution not perfect in 20 volumes.

Oil of wildmint soluble in about 11⁄2 volumes.

The oil of wildmint rotates the plane of polarized light to the right 12.59° at 21.7°.

The quantity of these oils was very slight so that no chemical examination could be made. They were distilled by Schimmel & Co., and obtained from Fritsche Brothers, their representatives in the United States.

UNIVERSITY OF MAINE,

ORONO, MAINE.

NEW BOOKS.

A. B. AUBERT.

By

WATER SUPPLY (Considered principally from a sanitary standpoint). WILLIAM P. MASON. Third edition. Rewritten. 448 pp. New York: John Wiley & Sons. Cloth. Price, $4.00.

The first edition of this extremely useful book appeared in 1896 and was noticed at length in this Journal. The chapters relating

to methods of chemical and bacterial examination of water which were a part of the earlier edition are now omitted, as they have since been expanded and published as a separate work. Much new matter has been added, however, to this third edition, and all important recent discussions seem to have received attention. At the present time few topics are of greater public interest than are those connected with questions of water purification on the large scale. The chapter dealing with this subject is full of timely information and is quite sufficient to give the general scientific reader a good idea of various practical methods and appliances.

J. H. LONG.

NOTES ON LEAD ORES. BY JAMES FAIRIE, F.G.S. London: Scott, Greenwood & Co. 62 pp. 16mo. Price, $1.00.

The book consists of a collection of information concerning all the lead minerals, including occurrence, hardness, specific gravity, blowpipe tests, and composition-just what is to be found in any standard work on mineralogy. It is well printed in large type. E. H. M.

GAS AND FUEL ANALYSIS FOR ENGINEERS. A compend for those interested in the economical applications of fuel. BY AUGUSTUS H. GILL, S.B., Ph.D. Third edition. New York: John Wiley & Sons. 1902. iv+104 pp. Price, $1.25.

According to the preface the substance of this book was given in the form of lectures to students in the courses of chemical, mechanical and electrical engineering at the Massachusetts Institute of Technology, Boston.

The author discusses in an exceedingly brief and yet clear and satisfactory manner the common forms of apparatus for technical gas analysis, their manipulation and uses. The methods of taking gas samples, their analysis, the measurement of the temperature of chimney gases, the preparation of reagents, the arrangement of the gas laboratory, and the calorimetric determination of fuel values are treated in separate chapters. Useful calculations in relation to the combustion of fuels together with some valuable tables add to the merits of the book. The illustrations serve fully for the elucidation of the text. The treatment of the subject is excellent and the book can be recommended as a useful aid to students of gas analysis. F. C. P.

VOL.

THE AMERICAN YEARBOOK of Medicine and Surgery FOR 1902. I, GENERAL Medicine. Philadelphia: W. B. Saunders & Co. 1902. 700 pp. Cloth, $3.00 net. Half morocco, $3.75 net.

This excellent work, which has been issued for a number of years, is under the editorial charge of George M. Gould, M.D., and presents brief summaries of the most important contributions to medical literature made during the preceding year. While naturally intended for practitioners of medicine the book will be found valuable and interesting by those chemists who desire to keep in view the advances in a field closely related to their own in many points. The fundamental importance of chemistry in medicine is becoming more clearly recognized from year to year, and this is well shown by a perusal of the pages of the Yearbook.

J. H. LONG.

INDICATORS AND TEST-PAPERS: Their Source, Preparation, Application, and Tests for Sensitiveness. A Résumé of the Current Facts Regarding the Action and Application of Indicators and Test-Papers Which Have Been Proposed from Time to Time, and are in Present Use in Chemical Manipulation, with a Tabular Summary of the Application of Indicators, Designed for the Use of Chemists, Pharmacists, and Students. BY ALFRED I. COHN, PH.G. Second Edition, Revised and Enlarged. First thousand, New York: John Wiley & Sons; London: Chapman & Hall, Limited, 1902. pp. ix + 267. Price, $2.00.

The first edition of this work which was reviewed in this Journal, 1899, p. 1176, now appears with an appendix containing the description of ten additional indicators in the style of the previous work. The book is a useful addition to the practical chemist's list of dictionaries. References to original articles are unfortunately not given.

The present writer agrees perfectly with the former reviewer in believing that Mohr's unsupported assumption of the cause of color had better have been omitted, and that the isolated discussion of the theory of indicators could well have been improved in the new edition. W. R. WHITNEY.

A TEXT-BOOK OF INORGANIC CHEMISTRY. BY DR. A. F. HOLLEMAN, rendered into English by HERMON C. COOPER, PH.D. John Wiley & Sons. 1902. viii+458 pp. Price, $2.50.

The difficult task of incorporating the ideas of the newer physical chemistry with the general descriptive matter necessary in a

text intended to introduce the student to chemical studies has been undertaken by the author of this work with boldness and discretion. The theory is not separated from the facts to which it belongs, but it is in every instance treated as an intimate part of them.

The concept of atoms and molecules is developed at an early stage, after a brief treatment of the properties and composition of water. The kinetic theory, dissociation, law of mass action, methods of determining molecular weights and several related topics are discussed, hand in hand with the description of the elements of the halogen group, and are treated with admirable precision and clearness. The question forces itself, however, upon the reader, whether it is wise to compress so large a part of the theory into the first eighty pages.

The presentation of the principles of thermochemistry is very satisfactory and that of the periodic system is adequate, the customary atomic volume curve being reproduced according to recent data.

A good deal of space is devoted to technological processes, eight pages being given, for example, to the manufacture of sulphuric acid. The few words relating to spectrum analysis could scarcely be improved upon.

The book as a whole has a marked air of scholarly distinction, for which part of the credit belongs to the translator. Very few passages bear any of the ear-marks of translation which too often disfigure American editions of foreign scientific books. While the descriptive matter is subordinated to the consideration of principles, it does not seem to the reviewer that the author has gone too far in this direction. It would not be impossible for some college classes to cover the entire ground of the text in a year's work. LAUNCELOT W. ANDREWS.

A BIBLIOGRAPHY OF THE ANALYTICAL CHRMISTRY OF Manganese, 17851900. BY HENRY P. TALBOT AND JOHN W. BROWN. City of Washington: Published by the Smithsonian Institution. 1902. pp. viii+124.

This is the fourteenth of the bibliographies pertaining to chemical subjects published by the Smithsonian Institution on recommendation of a Committee of the American Association for the Advancement of Science of which Dr. H. C. Bolton is Chair

man. For the portion 1785 to 1830 the present Bibliography is based largely on "An Index to the Literature of Manganese, 15961874," published by Dr. Bolton in 1875. The present work is, however, confined to the analytical part of the subject and is, apparently, very complete for that field.

W. A. N. JAHRBUCH Des Vereins DES SPIRITUS-FABRIKANTEN IN DEUTSCHLAND, DES VERFINS DER STÄRke-InteresSENTEN IN Deutschland und der BRENNEREI-BERUFSGENOSSENSCHAFT. Zweiter Jahrgang, 1902. 8vo. xvi + 471 pp. Berlin: Paul Parey. 1902.

This second volume of the Jahrbuch is edited by Dr. Delbruck and its high value to the fermentation and cereal products industries is thereby assured. And this volume certainly establishes the success of the undertaking to publish it.

The editor states in the preface that "the compass of the work has considerably extended this year, not because of prolixity on the part of reporters but because of the enormous increase in material to be treated, and in his oral report to the societies in their general meeting he says "the object of the yearbook is that the members may have the work of the year not in the detached parts of our Journal (Zeitschrift für Spiritus-Industrie) but in a complete volume at the close of the year. In connection with the Kalendar we publish, this presents a complete compendium of the developments of each new year."

* ** *

Dr. Delbruck has not exaggerated. It is almost a handbook as well as a yearbook, for nearly every operation in the fermentation, starch and starch derivatives industries is discussed with some suggestion for improvement. From the culture of the potato and barley, the production of malt and yeast, the control of the fermentation and distillation processes, to the separation and utilization of the finished products and wastes, each step has had the attention of specialists appointed to study them and the report in each case is full of valuable information. In addition to the reports from the different sections into which the works of the societies is divided, we are offered most interesting stenographic reports of the general meetings. It would be impossible to recapitulate here what is set forth in the book. It is enough to say that it is filled from cover to cover with facts of the highest scientific and practical value.