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Recent Books Potentiometric Titratioas. I. M. KoLTaoPa -od N. H. m m x . John Wiley 8. Sons. New ~ o r kCity. 1926. xii 345 pp. 14.5 X 23 em. a . 5 0 . -potentiomctrie Titration." is a work that every will welcome. The field that it covers has been the subject of many iecent and valuable papers. Potentiometrie analysir i3 a rather new tool of the greatest practical value t o both the re-ch worker and routine analyst. Some systematic and critical collection and evaluation of the means and method* so far proposed was orgently needed. Drs. Kolthoffand Furman have done this in a splendid manner. In the very beginning a distinction is drawn between eondvctametrie and potentiometrie titrations, the former being based on the measurement of changing resistance and the latter on hanging r m. f. Both have heretofore been clanzed as electrometrie titrations This distinction seems wise. The book is well-orpanired. The first part is devoted to s careful rnathematiealanalyri.of the theoretical principles involved. Here we find a thorongh discusion of the solubility product relation, of the neutralization of acid-strong, weak, and in mixture-f oxidation-reduction eqllilibria and poteotials, of the general conditions for potentiometrie titratians, ete. Sufficient eases are considered t o mahle the chemist to work out the equations for any special system that he may wish t o mnsider. The di9eussion applies to ordinary titrations also. The second part in devoted to practical application*. The various potentiometer systems and methods are deruibed and discused in a very thorough manner. Following this there in a di.eussion, with very full reference., of the silver, mercury, copper. iodine, hydrogen, oxygen and air, higher oxide. quinhydrrme, metal, tungsten. and glass electrodes. The last chapter deals with a large mmber of potentiometrie oridation-reduction reactions. The writer wishes to commend the authors' ertension of Si5ensen's 9~ (the ion exponent or negative log of the h~drogen-ionmncentration) t o ions other than hydropen. An excellent bibliography is included in this work, as well as rather full tables of normal potentials, ionization eonstants, solubility products, etc. I t is to be regretted that the table of normal potentials (taken from No. 8 der Abh, der Deutrehen Bunoenpesellrchaft. 1918) war not amended according to R. H. Gerke's "A Summary of Electrode Potentials." Chcm. R m . 1, 377 (1925). as the latter will appear in the International Critical Tables. However, the differ-
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ences are, in most -3, small. For -me workers, literature references to the valuer given in some of the tables might prove helpful oc. casionally, although this can scarcely be called a eritidsm. I n conclusion, the writer feels that he has made a most useful addition t o his library, and he is sure that teachers, advanced students, and practical workers ail1 agree.
MALCOLN M. H ~ m c Iotrodvction to. Theoretical Physics, Vol. u. A ~ T H U HAAS, R Ph.D.. Professor of Physics in the University of Vienna. Trandated by T. Verrchoyle. D. Van Nostrand Co., New 414 pp. 22.5 X 14 em. York, 1926. 1
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$0.00.
This volume deals with that part of the field of theoretical physics not covered by the prr vious volume. See Tms J o o m a ~ ,a, 710 11925). ~.~ The author has succeeded in these two volumes in presenting a comprehensive survey of the whole field of modern theoretical physics in a compact, concise manner. H e has done much to meet the need felt by all interested in physics, either directly or indirectly, of acquiring a knowledge of the experimental contrihutioo. made to the pbysieal sciences in recent yearsand an intelligent understanding of the theories predominating in that field. The subject-matter is admirably me. sented, clearly and l u e i d l ~written, each step developed without omissions, without eonfudne the reader by the ure of roml>hcafed and awerome marhcmsfrcal r ~ m b o l and i n o ~ m n r rxhi~h . m..v have hithenodrtmrd tbclrvrw~oin O~YICFI . -->. The whole compilation shows extreme.. . oains. taking care to render the t e x t readable and underrtandahle for students in any branch of science, all mathematics being expressed in terms of calelllun. A synopsis of the symbols used in the discussion of each portion of the text i.added f n the use of the sfudeof. These volumes form an ideal basic text either for the prospective specialist in physics, who can use i t as an introduction into any specialircd part of modern physics, or for students in any of the allied science., who are unable t o keep in touch.with the correlative work of the pbysickt. These books should prove valuable texts for class "re; affording a proper perrwetiue of the whole field of physics. Volume I1 treats of the atomic theory, the theory of heat, and the theory of relativity. un. der "The Atomic Theory" are discussed the elementary quantum, t h e theory of the hydrogen atom, R6ntgen rays, the theory of the elements. ~~~~
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VOL.3, No.7
RECENTBOOKS
and the general theory of spectra and of atomic structure. A general chapter on "Statirtics" provides an interpretation of energy ar applied to the modem eooceptsof heat and it=phmomena, discussed in the chapter on "Thermodynamics." "By resolving the object of phyrieal proceses. so-called matter, into an assembly of individual particlea, i t becomes po~sible f m theoretical phyrieo t o investigate all physical phenomena and states by means of methods which are Lnown quite apart from the province of physier ar st=. &ti-l methods." "The Theory of Relativity" deals with the special theory of relativity and the theory of gravitation. together with their ramificationr. In the appndiii sre found a summary of the whole baok by sertionn, and a "brief summary of the more important work carried out between the publication of the German edition and of the present English edition of Val. 11." ~
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C. G. E ~ C I L ~ N Industrial Stoichiometrg. WARRBN K. LHwrS, Head, Department of Chemical Enpineering. Massachusetts Institute of Technology, and PTofesor of Ceramic ARTRUBH. RADASCH, Engineering, New York State School of Ceramics st Alfred University. First edition, 1026. McGraw-Hill Book Company. Ine., New York. xi 174 pp. 1 3 figures. 15 X 23 em. $2.50.
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I n its physkal make-"-binding, paper. and t y p c i t might well s w e ar a model. a. 2. o u n Problems in Orgaoic Chemistry. H. W. UNDERwooo, Ja., Ph.D.. Instructor in Organic Chemistry, Massaeh"setts Institute of Technology. Cambridge, Marsachusetts. Pirst edition, one volume. McGraw-Hill Book Com233 pp. 6 pany. New York, 1926. xii tables of properties, 07 charts of reactions. 14 X 20 cm. $2.00.
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The purpose of the book is to present a series of study questions and problem^ which will require students to master the principles of organic chemistry and apply them to concrete cases. Although the hook has been written primarily for undergraduates, it includes large amounts of material of valve to graduatbstudents. The author has fulfilled his purpose admirably. Organic ehemirta of all degrees of advancement and proficiency can use the book with pleasure and profit. From the standpoint of chemical education, the book in thoroughly r o m d as far as its primary purpose in concerned. However, each chapter contains introduetoly material whieh is, perhaps. open to criticism in many cases. This is partly
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Thin volume of the McGraw-Hill Chemical Engineering brie. covers the methods of maring the chemical calculations involved in manufacturing praeerreo as well ar tho% required in design of plant and equipment. Among the subjeetn taken up are: Fuels and Combustion; Gas producers; Sulfur Compounds: Lime and Cement; Furnace and Kiln Desipn; Metallurgy; Plant Design; and Crystallirstion. As a text-book i t is designed to provide means for enabling the student already versed in the arithmetic of quantitative analysis to become familiar with the technic of the more involved and difficult calculations of industrial ehemirtry. particularly. the computations of cootiouou. processes. But it is meant to serve no less the man in industrial work. The authors' names alone should vouch amply for the quality of this work and the reviewer wisher only to add that it will 611 a need long felt by teachers of chemical engineering for a tertbook on the quantitative aspects of the subject. I t shonid pmve particdarly valuable in supplc menting Walker, Lewis, and McAdama' "Principle. of Chemical Enpineering," with which it harmonizes in scope and methods of treatment, and it will doubtless he widely adopted by users of that text. I t s appearance is an c n m r a d n g sign of the coming of other books, wherein the subject of industrial chemistry is to be given the treatment its importaoee warrants hut which, hitherto, it has received only in small meame.
may be found in some of the applleations of the Geneva nomenclature, in the misune of terms ?uch as "sapani6cation" and "molecular volume," and in the eonri3tent mimaming of hoessor trays, one of the distingui.hed chemists ever affiliated with the Massachusetts Institute of Technology. I n conclusion it should be emphasized that the hook fills a definite need in a phase of organic chemistry not usually covered in so thorough or extensive a manner. SXA, C. W m r ~ o ~ z Chemical Calculations. BBBNABDJAPPE. Instructor in Chemistry, Jamaica High School, New York City. New-World Science Series. edited by John W. Ritehie. World Book Co.. Yonkers-on-Hudson. New York. Cloth, xvi I59 pp. 13 X 10 cm. $1.28.
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As indicated in the preface, this book is intended to correct the deficiency found in hiahschool and college students in the matter of simple chemical calculations. "Both teacher and pupil are handicapped by a dearth of properly graded oroblemn to eo hand in hand with the r e ~ u l a r daily assignment.. . .The aim of this baok i s to 611 the gap whieh teachers of chemistry in secondary schools have felt e&ts in moat of the text-books used.. .Problems in this book are p~~gressivcly arranged according to a number of types which the student soon learns to recognize. They are a130 graded according to the degree of dimculty and order of leeson assignment.. .
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