REVIEWS 457 
in various periodicals, some of which are not available to many readers. 
The desirability of making the work in its entirety more accessible has 
led to the publication of the present volume, which contains little or 
nothing that has not been previously published, but brings under one 
cover work that has hitherto been scattered through the literature of 
chemistry. 
The first part of the book is devoted to simple compounds possible 
in sea water, with their hydrates, and solubilities, with particular 
reference to their phase-rule relationships with water. These are 
studied through a range including all reasonable temperatures of natural 
evaporation of sea water. Then more complex relationships, involving 
the equilibria between various combinations of these salts, their hydrates, 
and double salts, are studied with a rigorous application of the phase 
rule. 
The methods of work are carefully outlined and the results are 
shown in diagrams that have been models for subsequent phase-rule 
studies for the past decade. 
This monograph is a fitting memorial to the great chemist whom it 
commemorates and stands pre-eminently as an investigation carefully, 
thoroughly, and completely carried out—a finished piece of work. 
A. D. Brokaw 
Contributions to Economic Geology, to10. Pt. I. Metals and 
Non-Metals except Fuels. By C. W. Hayes and W. LINDGREN. 
U.S. Geol. Survey Bull. No. 470. Pp. 558; figs. 64; pls. 17. 
Washington, Ig1t. 
A collection of short papers and preliminary reports by various 
authors on investigations carried out during 1910. 
The following papers are included: 
Gold and silver: Trinity Basin, Cal.; Carson camp, Colo.; Upper 
St. Joe River Basin, Idaho; Ground Moraine in northwestern Montana; 
Elkhorn Mountains, Mont.; Ramsay, Talapoosa, and White Horse 
districts, Nev.; and Pinos Altos, N.M. 
Copper: Burro Mountains, N.M.; Ducktown, Tenn. 
Lead and zinc: Bear River Range, Idaho and Utah; Metaline 
District, Wash. 
Rare metals: Arsenic deposits at Brinton, Vt. 
Iron and manganese: Montevallo-Columbiana region, Ala. 
