The Natural History 

 of Igneous Rocks 



BY AU'RI-.I) MARKER 



Illustrated, cloth, 8vo, $3.00 net 

 A BRIEF SUMMARY OF CONTENTS 



Igneous Action in Relation to < iftilo^y \'ul< .micity Igneous Intrusion 

 IV:n>-r.i|>!iir.il Provinces Mutual Relations ot A^ori.itrd ligneous Rocks 

 Igneous Kmks and Thrir Constituent! Rock Magmas Crystallization of 

 Rock Magmas Supenaturation and Deferred Crystallization Isomor- 

 phism and .\li\i-d I'rvstals Structures of I^iu-ous Rocks Mincralizers 

 and Pnruinatolysis Magmatic Differentiation Hybridism in Igneous 

 Rocks Classification of Igneous Rocks. 



Rocks, Rock-weathering, 

 and Soils 



BY GEORGE P. MERRILL 



Curator of Department of Geology, United States National Museum, and Professor 

 of Geology in the Corcoran Scientific School, etc. 



With many Illustrations Full-Page Plates and Figures in the Text 

 Second Edition Cloth Svo Price $4.00 net 



" This is one of the most useful and most satisfactory manuals that has ap- 

 peared in recent years, possessing as much interest for the geographer as for 

 the geologist." Bulletin Amer. Geog. Society. 



In treatment, as in subject, Professor Merrill's work is notable. It is 

 strictly up to date, embracing the results of the latest researches, and duly 

 recognizing the work of contemporary investigators ; also it is made admi- 

 ral)!. MK-chanically by clear typography, good paper, excellent illustrations, and 

 a full index." National Geographic 



"A book brimful of facts obtained by workers in divers fields. The work 

 forms a highly important addition to our practical knowledge of geology." - 



Scientific . lincfican. 



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