REVIEWS 



British {Terra Nova) Antarctic Expedition, igio-ipij. Glaciology. 

 By C. S. Wright and R. E. Priestley. Quarto, pp. xx+487, 

 figs. 481, plates 417, maps XIV. London, 1922. 



This important work is the joint product of a physicist, C. S. Wright, 

 and a geologist, R, E. Priestley. The chapters on " Snow and Its Deriva- 

 tives"; "Ice Crystals Formed from Vapour"; "Crystalline Structure 

 of Ice"; "The Mechanism of Glacier Motion"; "Ablation and Thaw, 

 with Particular Relations to Antarctic Glaciers " ; and " A Review of the 

 Causes of Glacierisation " were written by Wright. Those on "Classifi- 

 cation of Land-Ice Formations"; "Structure of Glaciers"; "The Ant- 

 arctic Icefoot"; "Antarctic Fast-Ice"; "Antarctic Pack-ice"; "Ant- 

 arctic Icebergs"; and "Geological Climates of the Antarctic" were pre- 

 pared by Priestley, and that on "Ice Formations Characteristic of an 

 Advanced Stage of the Glacial Cycle" by the two jointly. This divi- 

 sion of labor necessarily implies some degree of independence of work 

 and of textual treatment, but just how much can probably best be learned 

 from the text itself. A general concurrence of views is claimed. The 

 reader will do well, however, to note the authorship of each of the chapters 

 as he reads them, for he may find that one sees through the spectacles of 

 the laboratory, the other through the binoculars of the field. The studies 

 actually made are, in the main, regional (Victoria Land), but the treat- 

 ment has wisely been given continental breadth by comparisons between 

 all known parts of Antarctica. There is thus brought together a vast 

 amount of material relative to the glacial phenomena of a great region 

 only imperfectly known heretofore. It will only be possible to notice a 

 few of the more outstanding features. We shall therefore feel at liberty 

 to disregard the order of subjects and touch as most convenient the themes 

 of most concern to students of geologic climates. 



As a background for more special subjects, let us first notice a tabular 

 summation of what are held to be the known glacial periods of geologic 

 history (p. 418). 



Some glaciahsts would add to the periods Hsted and some would per- 

 haps question certain periods included, but the table seems to fairly 

 represent the weight of competent opinion. The main things to be 



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