1010 JOURNAL OF CHEMICAL EDUCATION MAY. 1931

the instructor. To this end, the exercises are presented in nmsiderahle detail and the relevant theory is given in each case. References to well-known treatises of physical chemistry, too, are made a t the appropriate places.

The text records the course of experi- mental physical chemistry originating in the Technische Hochschule of Karlsruhe, and as modified and improved in the uni- versities of Munich, Erlangen. and Wiin- burg. The many years of testing out, with classes, of the directions of the text have brought to light the points of theory and practice which prove most trouble- some to students. These points have been given special attention in this text.

The text covers a remarkably wide field and contains a number of exercises usually not found in many of the semi-elementary courses of physical chemistry. The fol- lowing list SeNes to give a general notion of its scope and contents: molecular weights (in solution); vapor pressures and distillation of liquid mixtures; surface tension and internal friction of liquids; adsorption from solution; coagulation of sols; pH determinations; calorimetry; metabgraphy; radioactive transforma- tions; rates of readion (in solution); re- fradometry; spectro-photometry; elec- trical conductivity; transference; electro- motive force; and practical electrolysis. A number of different exercises are usually included under each heading.

The authors have succeeded in present- ing clearly the theory and the practical directions for each exercise. The in- structor will welcome such discussions as the so- and estimation of errors, details of setting s Beckmanu thermometer, di- rections for the calibration and mmparisou of mercurial thermometers and of thermo- couples, and other items of laboratory tech- nic with which the student is confronted. perhaps, far the first time. Also, the inclusion of the quinhydrone electrode, potentiometric and conductimetric titra- tions, ultra-violet spectrography. and radio- active transformations serve to bring the subject matter up to date.

The use of the capillary electrometer. certain thermoregulators, etc., may not appeal to the better-equipped laboratories, - - -

but their inclusion does not detract seri- ously from the value of the text.

The hook is teachable. In fact it serves to develop the student's manipulative skill and his practical evaluation of the meaning and import of each exercise. The hook should be welcomed by all who are engaged in the giving of laboratory in- struction in physical chemistry.

W. A. FELSINO

UNIVBASITY OII TUX- Ausnr*, T s u s

Qualitative Analyse mit Hilfe vm Tiipfel- reaktionen. Theoretische Grundlagen und praktischer Ansfiihrung. F&Z

FBIGL, Privatdozent an der Universitit Wien. Akademische Verlagsgesell- schaft M.B.H., Leipzig; McGraw-Hill Book Co., Inc., New York City, 1931. xii + 387 pp. 12 figs., 2 colored plates. 28 M, cloth, 26.40 M, paper.

Recent developments in analytical chemistry have emphasized the importance of physico-chemical methods of measure- ment and the fact that our limited number of specific reagents can be increased by utilizing the properties of organic com- pounds. Just as certain groupings of the atoms serve to develop color, other group- ings tend to develop specific reactions with inorganic ions. More and more the analyst is making use of organic reagents as this hook emphasizes.

During the last decade Feigl and his as- sociates have published more than fifty papers concerning special tests which can he carried ant with a single drop of solution. Many of these papers were published in a journal which does not have a wide cir- culation in the United States and it seemed a pity that this interesting and valuable work was not more accessible. To satisfy this demand, Feigl has collected together the tests that he has himself developed, together with tests prepared by o thm and with some material not previously pub-