Petrological Abstracts and Reviews 



Edited by ALBERT JOHANNSEN 



Ramsay, Wilhelm. "Ueber die Verbreitung von Nephelinsyenit- 

 geschieben und die Ausbreitang des nordeuropaischen Inland- 

 seises im nordlichen Russland," Fennia, XXXIII (191 2), 

 No. I, pp. 17. 



On the Kola Peninsula the high mountains of Umptek and Lujavr- 

 Urt consist of nephelite syenite. Other nephelite rocks occur in the 

 foothills of Turja and probably in the neighborhood of Kuollejavr. The 

 author gives a sketch map of the region over which fragments of these 

 rocks have been distributed by glacial ice. 



A. J. 



Reinisch, Reinhold. Petrographisches Praktikum, II Teil, Ges- 

 teine. Gebriider Borntraeger, Berlin, 1912. Pp. viii+217, 

 figs. 48. M. 7.60. 



In this, the second edition, the same general mode of treatment has 

 been followed as in the first. The book has been increased in size by the 

 addition of 37 pages and 26 figures, even though the chapter on the 

 chemical relationships of the igneous rocks has been omitted. The 

 parts dealing with eruptive and metamorphic rocks have been rewritten 

 entirely and numerous analyses have been added. The origin of the 

 rocks is not touched upon, the work dealing simply with the rocks them- 

 seh'd^ and their determination under the microscope. They are 

 described both megascopically and microscopically, and their meta- 

 morphism and weathering is discussed. Not only are chemical analyses 

 given, but each analysis is also recalculated according to the Osann 

 system. The book is strongly bound in linen, the press work is good, 

 and the illustrations, which are unusually good line drawings, are clean 

 and sharp. The addition of a diagram showing the relationship between 

 the different rock types would have been a help to beginners, since for 

 such the book is intended. 



Albert Johannsen 



625 



