Reviews — Geological Atlas of Gt. Britain and Ireland. 133 



in a current of carbon dioxide. The nature of the reactions are 

 described, for the oxides of sodium, potassium, and lithium, but for 

 the latter the investigation is incomplete. The optical i)roperties of 

 silicates of these elements are given. 



It is found that, '* within the temperature range investigated, there 

 maybe in melts a large proportion of carbonate in equilibrium with tlie 

 other components." In tlie discussion of the relations which hold 

 for such systems as these, the solubility of the gas in the liquid phase 

 must be taken into account. 



The authors are now investigating some systems analogous to those 

 discussed in this ])aper, in which the oxides Ti Oo and AlgOg are 

 introduced. The ultinuite results of this work must lead to a clear 

 understanding of the action of ' gas-mineralizers ', and will indicate 

 the conditions necessary for the crystallization from magmas of 

 minerals containing volatile constituents such as water, fluorine, 

 or carbon dioxide. 



VI. — Stanford's Gkological Atlas op Great Britain and Ireland 

 WITH Plates of Characteristic Fossils. Preceded by descriptions 

 of the geological structure of Great Britain and Ireland and their 

 counties, of the Channel Islands, and of the features observable 

 along tlie principal lines of railway. By Horace B. Woodward, 

 F.K.S., F.G.S. 3rd edition. 8vo ; pp. xii, 214. London: 

 Edward Stanford, Ltd., 1914. Price 12,?. \0d. post tree. 



With a geologically coloured map of Great Britain (frontispiece) ; 

 (1) a folding index (coloured) to geological maps, giving also to eath 

 formation the names of the principal organic remains or fossils ; (2) 18 

 sections and views in the text ; (3) 58 county and other maps, geologically 

 coloured ; (4) 16 plates of fossils. 



IT will interest his numerous friends, geologists, students, and others 

 to learn that this tliird edition was the very last piece of literary 

 and geological work upon which the author was engaged only a few 

 days befoi'e the internal malady, from which lie had so long suffered, 

 compelled him to lay down his active pen, which his clever, fertile 

 brain could no longer direct. AVriting in pencil, two days before the 

 end was reached, he said of this book : '' In a third edition it is only 

 necessary to call attention to the chief additions, etc., thus : the 

 present edition has been amplified by an account of the geological 

 features of the Channel Islands, and the writer is indebted to 

 Dr. J. S. Flett for some notes on rocks, personally collected in Jersey. 

 Further descriptions have been given of features observable along 

 railways in England and Wales. A number of small additions and 

 corrections have been made in the text, and the acreage of counties 

 has been revised, the areas given being land with inland water 

 exclusive of tidal water and foreshore. The maps have been revised, 

 notably in the case of the Silurian of Central Wales, as determined by 

 Professor 0. T. Jones; new railways and further names of places have 

 been inserted." 



A small photographic supplement to this Atlas has been prepared, 

 with the co-operation of Miss Hilda 1). Sharpe, which makes a further 

 interesting illustrated addition to the work. 



