BGIENCE-ADVERTISEMENTS 



Just Published 



PRINCIPLES OF 

 STRATIGRAPHY 



BY 



AMADEUS W. GRABAU, S.M., S.D. 



PROFESSOR OF PALiEONTOLOGY IN COLUMBIA UNIVERSITY 



EXTRACT FROM THE PREFACE 



THIS book is written for the student and for the professional geologist. 

 It aims to bring together those facts and principles which lie at 

 the foundation of all our attempts to interpret the history of the 

 earth from the records left in the rocks. Many of these facts have been 

 the common heritage of the rising generation of geologists but many more 

 have been buried in the literature of the science — especially the works of 

 foreign investigators — and so have generally escaped the attention of the 

 student, though familiar to the specialist. There has been heretofore no 

 satisfactory comprehensive treatise on lithogenesis in the English language, 

 and we have had to rely upon books in foreign languages for such sum- 

 maries. It is the hope of the author that the present work may in a 

 measure supply this need. 



The book deals with the successive spheres in detail. Chapter II is 

 devoted to the atmosphere; Chapters III-V to the hydrosphere; Chapters 

 VI-XXI to the lithosphere; Chapter XXII to the pyrosphere; Chapter 

 XXIII to the barysphere and Chapters XXIV-XXX to the biosphere. 

 The last two chapters are devoted to a consideration of the principles of 

 classification and correlation. Each chapter is provided with a bibliog- 

 raphy, this for some of the chapters including more than a hundred titles 

 each. Throughout the discussion the central idea has been the interpreta- 

 tion of structures in terms of genesis. 



Large Octavo, 1 1 50 pages, with 264 illustrations in the text. Cloth bound, price $6.00. 



A. G. SEILER & CO., Publishers 



1224 Amsterdam Avenue NEW YORK. N. Y. 



