Principles of Stratigraphy 



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



Professor of Palaeontology in Columbia University 



Large octavo, 1150 pages, with 264 illustrations in the text 

 Cloth bound ------ price $7.50 



Send for descriptive circular and sample pages 



A. G. SEILER & CO. 



1224 Amsterdam Avenue NEW YORK, N.Y. 



Excursion on the Rock River of 

 Illinois between Rockford and 



DlXOn Price 10 cents 



and 



Excursion Through the Rivers and 

 Harbor of Chicago Price w cents 



These are two of the seven 

 Bulletins of the Geographic 

 Society of Chicago. 

 Teachers of biology and 

 geology will find them of 

 especial importance for field 

 trips, lectures, etc. 



Write for descriptive circulars. 

 The University of Chicago Press 



Chicago .... Illinois 



FINE INKS and ADHESIVES 



For those who KNOW 



Higgins' 



Drawing Inks 

 Eternal Writing Ink 



Engrossing Ink 

 Taurine Mucilage 

 Photo Mounter Paste 

 Drawing Board Paste 

 Liquid Paste 

 Office Paste 

 Vegetable Glue, Etc. 



Are the Finest and Best Inks and Adhesires 



Emancipate yourself from the use of corrosive and 

 ill-smelling inks and adhesives and adopt the 

 Higgins Inks and Adhesives. They will be a 

 revelation to you, they are so sweet, clean, well 

 put up, and withal so efficient. 



At Dealers Generally 



CHAS. M. HIOQINS & CO., Mfrs. 



Branches: Chicago, London 



371 Ninth Street Brooklyn, N.Y. 



