+
C., 1928. 27 v pp. 14.5 X 23.0 cluded chapters an acid-base and onidaan. $0.10. tionweduction equilibria of milk, physical equilibria of milk, coagulation of milk, and The methods used by the United States freezing of milk and milk products. Part Geological Survey for analysis of the 111, the microbiology of milk and milk mineral content of waters are described products, covers sources and distribution in Water Supply Paper 596-H which of bacteria found in milk, metabolism and bas recently been issued under the above growth of bacteria in milk and milk prod- title as Pages 235-261 of "Contributions ucts, iduence of physical and chemical t o the Hydrolo= of the United States." factors on bacterial growth, and yeasts Copies may he obtained from the Superand molds of milk and milk products. intendent of Documents. Part IV, the nutritional value of milk and 0.REINMUTE milk products, and the physiology of milk Colloid Symposium Monograph. Val. V. secretion, indudes the two chapters bearEdited by HARRYB. WEISBR. The ing those titles, respectively. Chemical Catalog Co., New York If any general criticism of this hook is City, 1928. 394 pp. 15 X 22 cm. made, it will be that of too great brevity $6.50. in certain sections. This appears t o be particularly true of the first few chapters. This volume contains the twenty-four Thus the bases for certain conclusions are papers delivered a t the Fifth National rlot invnrinl,ly hid in an adequate manner, Symposium on Colloid Chemistry held a t which results i n 3 sornee,hat ilidxtic stylr. the University of Michigan, June 23 Certain inconsistenciesin the use of chemi- t o 25, 1927. Needless to say it is cal symbols likewise appear. A few addi- indispensable t o the library of every coltional words or phrases in the section deal- loid chemist, and i t would be a valuable ing with the methods of examination of addition to any chemical library. milk fats would aid materially in the interThe titles included are as follows: pretation of analytical data. 1. "Unity in the Theory of Colloids." chemistry of milk H. R. Kruyt. Part 11, the ~hysical . . and milk products, is particularly attrac2. "The Stability of Emulsions, Monotive to the reviewer. This difficult phase molecular and Polymolecular Films. of dairy science is treated in a manner that Thickness of the Water Film on Salt is both unique and unusually adequate. Solutions and the Spreading of Liquids," Each chapter is followed by a list of the Wm. D. Harkins. references which are cited in the tent. I n 3. "Adsorption and Crystal Form," this manner a bibliography, totaling more Chas. H. Saylor. than 1300 papers, is included in the mono4. "Adsorption from Solution by Ashgraph. Free Adsorbent Cbarcoals," E. J. Miller. In view of its completeness, this hook 5. "Some Unsolved Problems in the should prove useful to a wide range of in- Molecular-Kinetic Behaviour of Colloidal terests. Teachers of various branches of Suspensions," E. 0 . Kraemer. dairy science will undoubtedly use i t ea6. "The Measurement of Adhesion tensively as a convenient source of mateTension, Solid against Liquid," F. E. rial. I n addition, it should have a wide Bartell and H. J. Osterhof. sale among technologists, and manufac7. "Investigations on Molecular Sieve turers of dairy products. Membranes," Leonor Michaelis. C. H. BAILBY 8. "Synthetic Kidneys," Wilder D. Bancroft and R. L. Nugent. 9. "The Chemistry of Body Processes; Notes on Practical Water Analysis. W. D. COLLWS. United States Govern- The Nature of the Action between Gelatin ment Printing Office, Washington, D. and Electrolytes," A. L. Ferguson.
