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S E W BOOKS
istry. The chaptclr o n thc liquid s t a t e follons t h e chapters relating t o the g s t a t e s . a n arrangeincnt which permits discussion fro:ii both of tlic applicable points of view. T h e chapters o n atomic s t r u c t u r e , m o l c c d a r structure, :tnd radioactivity a n d nuclear reactions a r e particularly good, as arc also t h e nutnerous other discussions throughout from t h e structural point of view. T h e second lan. of therniodynatnics is introduced after a short chapter on solutions, and i j follon-et1 b y a discussion of pliaie equilibria i n oiie-co!iiponent s y s t e x s . T h e n , before introducing tlie stutlcnt t o niorc co:iiplicated phase equilibria in niu1tico:nponnt systems. t h c authors ninlcr a careful unification and extension of concepts in discmssions of cscaping tendcnc,y and t h c propertics of ideal solutions. T h e erc~ellent chapters on cheniicnl cquilibria ; m i lcinet ics contain nuni(’rous exercises n o r k e d out i n detail a n d , subsequently, nunicrous prohlenis for t h e s t u d e n t . T h e chapters on conductance and transference ant1 on electromotive f o r c e are well done: as :ire also t h e final chapters o n interactions of light lvith :nattcr and o n surface phenometm. .is a result of t h e sonicwhat niorc descriptive point of view cven sonie of t h e simple derivations are licit includcd, hut i,cfercnces t o standard norlcs Tvhere they inay be found a r e given, and they may usually easily h e supplied in the lectures. T h e literature references are soincivhat too few, arid very often quite troublesome t o follo\V up n-hen only t h e a u t h o r and year arc given; this tendency detracts someiyhat froin t h e book’s value as a reference n-ork. The first editions of all t echnicnl hooks contain errors, a n d a fctv of t h e important ones prescnt here m a y be \vorth noting. Cerium is not t h e only rare e s r t h i n ( p . lSI)), as is evidenced b y higher valence s t a t e s which t h e 4.f electrons play n c.hcniiral 1.61~ of praseodymium and terhiuw. T h e authors have confused t h e meanings of the terins “lattice” and “structure” in t h c r-hapter on t h e crystalline s t a t e , and have used t h e m interchangeably. A number of tlie rostrictions on thermodynamic variables in statements and equations i n C‘1iaptc.r ST- have, h c n omitted. Thus ( p . 1.56) & = I0 for a reversible process only if I!‘ (as x e l l as T ) is constant. E q u a t i o n (4) on p . 2.57 a n d t h e s t a t e m e n t s regarding AF i n Section 10, belon-. arc, of (’ourse, t r u e with t h e restrictions t h a t both p a n d 7’ a r c cons t a n t . Equation (S) on p . 260 and t h e first equation on p . 267 need the restriction t h a t p is constant. The soc~ontlc,luation on p. 267 is t r u e only \rhen 1’ is c o n s t a n t , and is given correctly on p. 259. T h e publishers have ~ ~ o i ~ i i r r a ?in e i lpresenting this book estremely well, on escellent paper, a n d with very few n i i ~ p r i n t s , 1,-nder t h e guidance of a c*o::ipetent teacher t h e student !Till find this a n escellent beginning t e s t in physical chemistry, and it is most heartily recommended. W I r m . < x S.LIPSCOVB.
X i c h l c , - d , i s c i i ~ t l t : The Che!nislr?/ oj” / h a Corimn COmpOUlkdS. 1’02. Iv. T h e H e t e r o c y c l i c C o m p o u n d s a n d Orgnnir Free Ra(1icnIs. T h i r d English edition, based upon t h e twelfth German edition. Translatetl tiy 11. I-. Ilarlicn a n d A . J . l l e e . s v C 408 pp. S e w York: Elsevier Puhlishing C‘onipmy, 1917. Price: $12.00. This is the fourth. and final, volumc of the literal translation of Richter-rlnschutz. T h e t e s t is t h a t of t h e tn-clfth Gernian etlitiun, published in 1935; t h e material in this translation corresponds t o Volume I11 (hetero:.yclic co:iipountls) and t o a portion of 1-olume 11,p a r t 2 (radicals), of t h e German edition. T h e section on t h e heterocyclic compounds was written h:; F. Reindcl a n d t h e translation is b y 11.F.D a r k e n ; t h e section on radicals was written by Ludn-ig ;inschutz and t h e translation of this is by -4. J . X e e . T h e hook is t h e standard “Richter”, n-ell known t o all chemists. T h e conventional plan of treatment has been follon-ed. The btiok-~iial;ingis good b u t , all in all, i t is difficult t o understand t h e necessity f o r a translation of a book now t n e l v e years old-a book which can hardly be of much more t h a n historical value, and this reviewer feels t h a t t h e energy p u t into the niaking of this book could \vel1 have been expended more profitably on soniething else. The price ($12.00) is excessive. I,EE IRVISSIIITH.
