2 APRIL 1927, Page 28

A COMPREHENSIVE TREATISE ON INORGAN AND PHYSICAL CHEMISTRY. By J.

W. M Vol. VII. (Longmans. 63s.}—Dr. Mellor has undertaken prodigious task of bringing out single-handed a comprehensi work on inorganic chemistry on the scale undertaken Germany by a large body of experts working under the mo or less co-ordinating direction of one or two men. The we is progressing at an astonishing rate, for the first vol appeared as recently as 1922, and we now welcome the seven When it is mentioned that each volume contains sometlf like a thousand pages, and that a complete body of refere is given on every sub-division of the subject, the lobo involved can be imagined. Being produced by one m the work has a unity of plan and performance which is usually found in so encyclopaedic an undertaking. The volume deals with elements of Group IV., from titanium thorium, and with the inert gases. In consequence it colts' an account of the work so far done on the new eleme hafnium. Dr. Mellor is to be congratulated on the speed a smoothness with which his task is moving to a close.