VOL.4. No. 2
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essentially a manual for beginners as most of the exercises involve the simplest procedures and but little special apparatus is required. Because of the number and variety of the exercises, teachers in a number of fields related to colloid chcmistry will welcome the English translation of this standard German manual. While the order of exarises may represent the procedure followed in Germany in the teaching of colloid chemistry, i t is not the order used by colloid chemists who present the subject deductively. Thus the book starts off with the preparation of colloids, including peptization methods, and the phenomena of adsorption and peptization are not taken up until near the end of the volume. The user will not only choose the experiments hut will modify the order to suit his needs. I t is unfortunate therefore that the translators did not supply the index which the authors failed to furnish. HA= B. WEISEX
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names, the reviewer is gratified to see the appearance of more and more new names attached to important contributions. The papers included in this volume are as follows:
1. "A Survey of the Main Principles of Colloid Science," by James W. McBain. 2. "The Colloid Particle as Revealed by Catalytic Studies;' by Hugh S. Taylor. 3. "The Water Equilibrium," by Wilder D. Bancmft. 4. "Making and Breaking Emulsions," by Wheeler P. Davey. 5. "Emulsification: A Study of Oil Soluble Emulsifying Agents," by Brian Mead and John T . McCoy. 6. "The Mechanism of Adsorption and of the Swelling of Gels," by Charles Terzaghi. 7. "Specific Ion Effects in the Behavior of Tanning Agents toward Collagen Treated with Neutral Salts," by K. H. Gustavson. 8. "Observations of the Colloidal Behavior of Aqueous Gelatin Systems;' by Colloid Symposium Monograph. Vol. N, Elmer 0. Kraemer. Edited by HARRY BOYERWE~sB~,chem9. "Mass Action Effects in the Interical Catalog Company, New York City, action of Gelatin and Acids," by W. K. 1926. 378 pp., 15 X 22 cm. $6 50. Lewis and C. F. Daniell. 10. "The Helmholtz Double Layer ReThe present volume contains the twenty-four papers presented a t the lated to Ions and Charged Particles." by Fourth Annual Symposium of Colloid E. F. Burton. Chemistry held a t the Massachusetts In11. "X-Rays and Colloids." by George stitute of Technology in June, 1926, and I,. Clark. 12. "The Stmcture of Ramie Cellulose constitutes a very important addition to the growing literature on this subject. as Derived from X-ray Data," by W. H. . Wo. Ostwald's phrase "the chemistry of Dare and 0. L. Sponsler. the neglected dimensions," surely no 13. "Organophilic Colloids," by G. longer is applicable for the literature in Stafford Whitby. 14. "Colloidal Properties of the Surfacc this field grows a t an amazing pace. The annual symposium serves to bring to- of the Living Cell." by J. F. McClendon. 15. "The Function of Carbon Memgether the best of the American work of each year and each paper is subjected to branes in Osmosis," by F. E. Bartell and the most critical discussion prior to publi- J. J. Osterhof. 16. "Elechoendosmose through Woad cation. The material contained in the present volume covers the usual wide Membranes," by Alfred J. Stamm. 17. "The Place of Adhesion in the range and maintains the high standard Gluine set in previous years. .of Wood." . bv . Frederick L. Browne Whereas, a few years ago a list of Ameri- and T. R. Truaa. 18. "Methods for Cutting and Differcan workers in this important field war rather limited and consisted of well-known ential Staining of Microscopic Sections of
Hardwood Glue-Joints," by Arthur I. Weinstein. 19. "Flocculation and Deflormlation of the Silver Halides," by S. E. Sheppard and R. H. Lambert. 20. "Pectin Jellies," by Miss G. Spencer. 21. "Cataphoresis, Electrical Charge, Critical Potential, and Stability of Colloids," by H. R. Kruyt Raodvoets and P. C. van deYWiIligen. 22. "The De-Inking of Paper," by Thomas R. Briggs and F. H. Rhodes. 23. "The So-called Adsorption of Ferric Oxide Hydrosol by Charcoal," by Arthur W. Thomas and Thomas R. LeCompte. 24. "Ionic Antagonism in Colloid Systems," by Hamy B. Weiser. J o s s ~ nH. MATMEWS
The experiments in this manual are designed, as the author states in his preface, for the study of milk and its products from a biochemical standpoint. The hook is admirable in its wnciseness. Tests of equipment and required material, as well as directions of procedure, are explicit and definite, minimizing the time required from both student and instructor for manual preparation. An excellent feature is a list of references following each experiment. The Laboratory work is not taken up from the analytical standpoint but teaches the use of viswsimeters, tensiometers, hydrogen-ion apparatus, and other equipment now employed in wlloidal research. The first chapters of the book take up chemical and physical properties of milk A Text-Book of Inorganic Chemistry. and its constituents. Interesting experiEdited by J. NEWTONFRIEND,D.Sc., ments are given on the microswpic apPh.D., F.I.C.; Vol. VII. Part 111. pearance of milk, milk emulsions, and wlChromium and Its Congeners. REECE loidal dispersions. The wlloid particles H. VALLANCE,M . ~ c . , A.1.C. AND are studied with the aid of the ultramicroA R ~ U A. R E L D R ~ G EB.Sc., , F.I.C. scope. Skim milk is subjected t o dialysis J B. Lippincott Co., Philadelphia, using collodion bags. The bags made 1926. xxvi 380 pp. 15 X 22 cm. according to the direction of the author give the best results of any ever prepared $8.50. by the reviewers. This volume of the well-known series The chapters on butter and rennet covers the elements chromium, molyb- coagulation aim to give an understanding, denum, tungsten, and uranium. The wntinuing the biochemical standpoint, of treatment is similar to that of the pre- the properties that affect the commercial viously published volumes, giving a gen- value of butter and milk in its relation t o eral discussion of the elements and of all cheese and ice cream manufacture. Here their important inorganic wmpounds. the references touch also the same properThe final chapter is devoted t o the radio- ties in their biological relationships. activity of uranium and its disintegration The quantitative analysis of milk might products. have been made more complete by addina The literature has been well wvered and the analysis for lactose, calcium, and phosthe descriptive matter brought down t o phorus. include recent investigations. The referI n the appendix are found tables of indiences are abundant. A table is included giving the dates of issue of all the import- cators, buffers, specific heat of milk and a n t chemical journals published since milk products, determination of total solids of milk from specific gravity and 1800. G. H. CARTLEDGE percentage of fat, and other tables equally important. The exercises outlined are based on six Laboratory Experiments in Dairy Chemistry. LEROYS. PALMER,Ph.D. John years' experience a t the University of Wiley and Sons. New York, 1926. Minnesota, and the author believes t h a t riii 84 pp. 15 X 23 cm. $1.50 net. the experiments will "work" in the hands
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