3 103
NEW BOOKS
mental technique, and consequently the book cannot be regarded as entirely representative of modern experimental methods. The use of the thermionic valve in potentiometric measurements is described but there is no mention, except in a foot-note, of its employment in the determination of electrical conductivity, and the chapter dealing with the latter suhject is unaltered. The book would have gained in value if some of the more rarely used approximate methods, especially of determining osmotic activity, had been omitted and the space devoted to a fairly full treatment of more accurate methods. I n spite of this however there is no doubt that the book will continue to be of the greatest value as an introduction C. S.S a l m o n to the study of experimental physical chemistry.
+
93. L o n d o n : .\leihim, and Thermodynamics. By 8 . TT. Porter. I ; X I 1 c m ; p p . u Co,, 2932. Price: 2 shillings, 6 pence. The author intended this monograph to “enable a reader to understand the logical foundations of the suhject, and not only to see the kind of applications that are made of thermodynamic principles in various parts of physics, but t o be able safely to apply them himself to further problems.” He has succeeded admirably. An enormous amount of information is packed into very small compass, partly by fine writing and partly by a free use of the “language” of mathematics. K o t that more than a knowledge of the elements of calculus is required, hut the reader must be able to use such knoidedge freely. The outlook is physical rather than chemical, though the chapter on “equilibrium” deals hriefly with the isochore, the isotherm and the phase rule. Classical notation is employed in preference to that of the G. S . Lewis school, the “Free Energy” of which is called the ‘,Gibhsfunrtion” in this work. and there is no reference to “activity.” The foundations of the subject are, however, exceptionally a-ell presented. I,. J . Hiidleston
Errata 1-ictor I
1.258
50
0
00131
2.161
2 01
0
01342
2
680
1.99
3305
~
o 00068 00134 0.00248
00
6.00 4.40
0
p. 2279 Table I X under Barium Nirate Series B26column IO* change o 2239 to o 02239 0
A
z 426 ~
IO
082
(-Z~Z~)IO-~K
00067 .
~ 2
o 608
e
-Error ~o
r
I 215
I . 822
zoo
1.512
3 00 3.53
I
,427
K
0.0330:
o 4276
0.04276
0 5835 0 05835 under Barium Kitrate?' Most Probable a111 =2.q column Att change o 00539 to 0.00535 column Att - Ato change av. 0.00045 to av. 0.00044 Most Probable a[3] =3 IOA col. Att-At, change av. o 00009 t o av. o.oooo8
under Potassium Sulphatezg Most Probable a111 = z 8i col. Att change 0.01j36 t o 0.01436 under Barium Chloride reference toz7should be tozg under Barium Chloride30 Most Probable a [ I ]= Z .6Acol. Att change o 02j60 to 0.02736
0.01047 0 02053 0.03047 0.04029 0,05005
o 01056 o 02071
0.03060 0.04032 0 04989
p. 2280 Table X under Xantho-Cobaltic Ciilnridej' e Most Probable a[I]= I . SA coi. ( - Z I Z I ) change 1.06778 t o I ,06792 col. &,-At, change -0,00092 to $0.00092
% (. . . ,) ( 08a)
p. 2283 equation (18) last term should read -0,30764 p. 2287 reference p. 2288 reference 30
(1927)should read p. 558 should read (1925)should read (1925)should read
ai31
At calc.
I
(1929) p. 358 (1924) (1910)
Gronwall, LaMer and Sandved: 29,358 (1928). Physik.
z.,
p. 367 equation 34 expression -(a- I - 10% &'/an) should read - (m - I - 10-3crn8V/~3n)
10%
