(1) A System of Physical Chemistry (2) The Determination of Hydrogen Ions (3) The Physico-Chemical Properties of Steel (4) Die Reaktionen des freien Stickstoffs

Abstract

(i) PROF. LEWIS' “System of Physical Chemistry” has been reviewed in these columns on two previous occasions, in September, 1916, and in May, 1919. Only a brief notice is therefore required of the third edition of the second volume of the series. The' principal additions that have been made deal with o the e.m.f. method of determining the transport number of an ion, as employed by Maclnnes and Parker, the work of Richards and Daniells on thallium-amalgam ' cells and of Tolman on centrifugal cells, American work on ionic activity, experimental work in support of Donnan' theory of membrane-equilibrium, and the work of McBain on colloidal electrolytes. Much of this new material is described in the words of the original investigators, as has already been done in earlier parts of the book.

(1) A System of Physical Chemistry.

By Prof. W. C. McC. Lewis. (In three vols.) Vol. ii., Thermodynamics. Third edition. (Text-books of Physical Chemistry.) Pp. viii + 454. (London: Longmans, Green, and Co., 1920.) 15s. net.

(2) The Determination of Hydrogen Ions.

By Dr. W. Mansfield Clark. Pp. 317. (Baltimore: Williams and Wilkins Co., 1920.) 5.50 dollars.

(3) The Physico-Chemical Properties of Steel.

By Prof. C. A. Edwards. Second edition, thoroughly revised. Pp. xii + 281. (London: Charles Griffin and Co., Ltd., 1920.) 21s. net.

(4) Die Reaktionen des freien Stickstoffs.

By Prof. W. Moldenhauer. Pp. viii + 178. (Berlin: Gebrüder Borntraeger, 1920.) 26 marks.