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table to each direction by a line of appropriate length directed in the 

 same sense. By doing so one gets a drawing called a diagram by the 

 author. The diagram enables us to find by graphical or — ^more accur- 

 rately — by arithmetical methods, figures characterizing the state of 

 folding with respect to its intensity, direction, and uniformity. There is 

 also shown the possibility of calculating the exactness of those figures, 

 so that the tectonics of different areas may be compared in the same 

 way as the features of organisms are compared in biometry. 



The mathematical methods used by the author are rather simple 

 ones which may easily be understood and used by every field-geologist 

 interested in this kind of research. On the other hand, a more exhaustive 

 treatment of the mathematical problems connected with the matter 

 seems to be indispensable for further progress. No attempt has yet been 

 made to utilize this system in regions more intensely disturbed, such as 

 those of truly alpine character. It may be doubted whether it will be 

 possible to do so. — Author's Abstract. 



Bibliography of Indian Geology, Part II. Index of Localities. 

 Compiled by T. H. D. LaTouche. Published by order of 

 the Government of India. Calcutta : Sold at the Office of the 

 Geological Survey of India, 27, Chowringhee Road. 1921. 

 Price, I rupee. 



Die Oberfldchengestaltung des dstlichen Suganer Gebietes (SO-Triol), 

 von Robert Schwinner. Ostalpine Formenstudien, Abtei- 

 lung 3, Heft 2. Mit i Abbildung und 2. Tafeln. Berlin: 

 Verlag von Gebriider Brontraeger, 1923. 



The Geology of the Lower Findhorn and Lower Strath Nairn, includ- 

 ing Part of the Black Isle near Fortrose. By John Horne. 

 Memoirs of the Geological Survey, Scotland, 84 and part of 94. 

 Edinburgh, 1923. 



Amerika: Eine Uebersicht des Doppelkontinents. II Geographische 

 Kulturkunde. Von Dr. Karl Sapper. Sammlung Goschen. 

 Berlin und Leipzig: Walter de Gruyter u. Co., 1923. 



Hawaiian Volcano Observatory, Monthly Bulletin of the, Vol. X, 

 No. 9, U.S. Dept. of Agriculture, Weather Bureau, Honolulu, 

 Hawaii, September, 1922. 



