refrained “from bcconiiiig too deeply iiivolvecl in the theoretical and the argumentative aspects of the various hypotheses dealing with the chemical structure of proteins, of the relations of protrins t o immunological reactions, of theories of denaturation and detoxication, as m l l as certain thermodynamic considerations.” Ample references for further reading are given t o t h e current publications and to the larger treatises. The book describes the isolation from protein hydrolysates of the accepted amino acids, their syntheses, and methods of analysis. About one-third of the text deals with the metabolism and the nutritive value of the proteins and their constituent amino acids. This portion treats of the r61e of amino acids in detoxication, the nietabolisni of the amino acids including the intermediates involved, and a consideration of thc evidence t h a t certain of the acids are indispensable in t’hediets of nian and the higher animals. The remaining onethird of the t e s t treats of the structure and the denaturation of proteins and includes a brief suniniary of the proteins as antigens. Throughout the text the applicatioiia t o clinical chemistry are indicated and given the niajor emphasis. ‘The most current vicvqioints and techniques are described; for example, t h e very recent inethod of assay f o r amino acids by the use of microorganisms is mentioned. r . I he appendix coriiairis :I list of patents issucd in the 1-nitcd States on amino acids and relatcd compounds, most, of which date from 1980. \v. 11.~ A N D S T R O l I . A l l y c n c e i / t e I.’iiriktiu/ie/~liceu,.ic-~I:’/liptiscifeFzi/~kLi~,ie,l--Geo,,ietlische Fztnktio,lentheoiie. By A . HURTT-ITZ .ISU R . (’OI-RIXT. 53.1 pp. Rerlin, 1929. I’uhlished and distributed hy Interscience Publishers, h e . , Seiv I-ork. Price: $7.50. This book is divided into tvio parts and presents the theory of analytic functions from t r o different standpoints. The first part, n-ritten by Hurivitz, develops the subject almost entirely from the arithmetical point of view in the spirit of Weierstrass. I n the second part of the 1100k, by Courant, the main cmphasis is placed on the geometrical aspects of the suhjcct which have groivn out of the original concepts and discoveries of Riemann. I n this t hirtl cdition no changrs hnve been ni:ide in the first part aside from niinor improvements i ti tlrt:iils. Tlic sccond p a r t , Iio\\-evvi~,has hccn citended and rearranged in many places so :LS to tkllic :ivcnuiit of txsc.cnt contributions t o the sul)jcc:t, and the introduction has becn cspancled so that 1 1 0 ~either one of the tivo parts may hc read independently of the other. FULTON KOEHLER.
C‘heriiical fi/~(/it~eei~i/q/ 7’iifr/,cuc(!/,ici/,iic.~. 13y I 3 a ~ s i , F. ~ rDODGX.664 pp. Seir-York: The l I c ( ~ r a i v - I ~ iBooli l1 (‘otiipatiy, Ttic.. 1 : U . Price: $6.00. ‘J’hnuph this h i o k K H S written f o r usc hy gradwttc studcnts, i t is also very useful for uiii1crgr:tduatcs ticcausc i t i q lxisctl o n tht, fiindanicntal training that chemical engineering s(tidcnis shoriltl wceivc i n the first t h w c ycoi’s of their cnursc. The first two chapters (levrloi) 1 l i r i’undanientnl c*oricrptH :11it1 tli,finitioiis uiitlrrlyi ng thi, la\vs of t I i e r ~ i ~ i ~ ~ l y i i : ~ t i i i ~ ~ s . J I I ~ W :ire follo\vcd 1)y :I r1i:il)lrr o n t 110 iir:ithcni:iiic.nl :ll)I)lYJa(’h t o siniple syst,enis antl on(: 1111 t h e iiiorc coniplex iriiis. (‘1ialitci-j \- nntl \-I sri up cliffcrcntial equations and tlicir iirtvprations of tlic t1icrii~otIyri:iniic‘prolierties. Thus thc foundations of the nppliratioiis of 1he operations antl proccssru of clicmiral ciigineering have been laid. These are prcsentcd in separate chapters o n compression and expansion of fluids. heat, transfer, refrigeration, chemical reaction eqnili1)rinni. vziimrizat inn and cnndensntinn equilihria, distillation processes. The subject material of this booli is 1)wsentetl in it clear i i i n i i i i c ~ r . Though niathcmatics is used freely, this supposedly dry subject is made interesting and understandable. The applications are well selected though limited in number. H o m v e r ! if the first six chapters have been mastered, the student should he able to rstend the applications in other direc-
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