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Outlines of Geologic History with 

 Especial Reference to North America 



Symposium Organized by 



BAILEY WnXIS 



Compilation Edited by 



ROLLIN D. SALISBURY 



GEOLOGISTS and all readers of geologic 

 literature will welcome the publication, 

 in book form, of an important series of 

 essays and discussions on the subject of geologic 

 correlation under the title, Outlines of Geologic 

 History with Especial Reference to North America. 

 They embody the present state of knowledge 

 and opinion concerning many of the funda- 

 mental problems of North American geology, 

 and form an admirable supplement to earlier 

 treatises and manuals. 



The value' of the book is greatly enhanced 

 by the fifteen paleogeographic maps by Bailc)' 

 Willis which accompany the papers. > 



316 pages, 8vo, cloth; price $1.50, postpaid $1.65 



The University of Chicago Press 



Chicago ... Illinois 



Model 

 "K.M' 



^ OPTICAL AMD MECHANICAL, 

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LEITZ PETROGRAPHICAL 

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for routine investigations 



It is provided with the same features as our large research 

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 Wide tube and eyepieces of enlarged diameters which renders 

 a field of view 50% larger than those of other manufacture. 

 Improved illuminating systems. 

 Its liberal size permits the accommodation of all existing acces- 

 sories, including "Federow" Universal-Rotating-Stage. 

 We offer an extensive line of petrographical microscopes and 

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 or elementary investigations. 



The microscope "S.M," for synchronic rotation of both 

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Leitz Microscopes are recognized throughout the world as leading 

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Write for complete Catalog II-B {F) 



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