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THEORETICAL AND PRACTICAL GRAPHICS. 



An Educational Course in the Theory and Practical Applications of Descriptive Geometry and 

 Mechanical Drawing, prepared for Students in General Science, Engineering, or Architecture. By 

 Frederick Newton Willson, C. E. (Rensselaer), A. M. (Princeton). 4to. Cloth. Price, $4.00, net. 



Introduction to the Theory of 

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By J. Harkness, Bryn Mawr College, Pennsyl- 

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Infinitesimal Analysis. 



By William Benjamin Smith, Professor 



Mathematics in Tulane University. 

 Vol.1. Elementary: Real Variables. 

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THE ELEMENTS OF SOCIOLOGY. 



By Franklin Henry Giddings, Professor of Sociology in Columbia University ; 



Author of " The Principles of Sociology," " The Theory of Socialization," etc. 



Crown 8vo. Cloth. Price, $1.10, net. 



"The Elements of Sociology" is arranged in accordance with the analysis presented in "The Theory 



of Socialization," and contains, with abundant descriptive and illustrative matter, the elements of the subject, 



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NEW AND CHEAPER EDITIONS. 



Guesses at the Riddle of 

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And other Essays on kindred subjects. By GOLD- 

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" One can not fail to be interested in this plain, 

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 of a brilliant mind, reflecting on the experience of a 

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Gospel for an Age of Doubt. 



The Yale Lectures on Preaching, 1896. 



By Henry Van Dyke, D. D., LL. D., Pastor of 



" The Brick Church," New York. 



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NEW BOOKS 



A Companion Volume 



to " The Old 



Santa Fe Trail." 



THE GREAT SALT LAKE TRAIL. 



By Col. H. Inman and Hon. W. F. Cody (Buffalo Bill). 

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By COL. INMAN. 



Illustrated wltb full-page 



plates and drawings 



in the text. 



The Ranche on the Oxhide. 



A story of the ranche life of boys and girls in the 

 far West before the railroad reached Kansas. 

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The Old Santa Fe Trail. 



With photogravures from sketches by Frederic 

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FOUR-FOOTED AMERICANS AND THEIR KIN. 



By Mabel Osgood Wright. Edited by Frank M 

 Chapman. Illustrations by Ernest Seton Thompson. 

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 A new book for the young lovers of animal life. An odd, interesting story about American mammals. 



In The Heart of 



Nature Series 



By the author of 



" Citizen Bird," etc. 



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