204 abstracts: geology 



The following compounds occur: Silica, SiOa; potassium hydrogen 

 disilicate, KHSi^Os; potassium disilicate, K2Si205; potassium disilicate 

 monohydrate, K2Si205.H20; potassium metasilicate, K2Si03; potassium 

 metasilicate hemihydratc, K2Si03.5H20; and potassium metasilicate 

 monohydrate, K2Si03.H20. 



The detailed results of the experiments are summarized in tables 

 and also presented graphically by means of curves and photographs of 

 solid models. 



A short discussion of some of the theoretical considerations which 

 govern the equilibrium relations in binary and ternary systems con- 

 taining a volatile component is given and the proper use of the term 

 "solubiHty" is discussed. G. W. M. 



GEOLOGY. — Geology of Massachusetts and Rhode Island. B. K. 



Emerson. U. S. Geological Survey Bulletin No. 597. Pp. 289, 



with maps and illustrations. 1917. 



This treatise, which is accompanied by a large geologic map of 



Massachusetts and Rhode Island embodying the latest information, 



describes in detail the distribution, character, and relation of the many 



varieties of sedimentary and igneous rocks exposed in these two States. 



R. W. Stone. 



GEOLOGY. — Anticlines in the southern part of the Big Horn Basin, 

 Wyoming. A 'preliminary report on the occurrence of oil. D. F. 

 Hewett and C. T. Lupton. U. S. Geological Survey Bulletin 

 No. 656. Pp. 192, with maps, sections, and illustrations. 1917. 

 This report gives information regarding 50 domes and anticlines in 

 the south half of the Big Horn Basin, Wyo., and contains many struc- 

 ture contour maps. 



The area described embraces some productive oil territory in Wyo- 

 ming that is undeveloped but very promising. Besides the Greybull, 

 Torchlight, and Grass Creek anticHnes, which are already sufficiently 

 ileveloped to contribute largely to the production of oil in Wyoming, 

 there are seven or more domes and anticlines in which oil or gas has 

 been struck, but which are not yet sufficiently drilled to indicate their 

 value as oil reservoirs. Thus 11 of the anticlines here described have 

 already proved to be productive. 



The probability that the remaining anticlines and domes described 

 in this resort may contain oil or gas has been carefully considered by 



