J). VAN NOSTRAKD. 19 



Nugent on Optics. 



13mo. Cloth. $3.00 



TEEATISE ON OPTICS ; or, Light and Sight, theoretically and 

 practically treated ; -with the application to Fine Art and Indus- 

 trial Pursuits. By E. Nugent. With one hundred and three 

 illustrations. 



" This book is of a practical rather than a theoretical kind, and is de- 

 signed to afford accurate and complete information to all interested in appli- 

 cations of the science." — BounH Table. 



Barnard's Metric System. 



8vo. Brown cloth. $3.00. 



THE METRIC SYSTEM OF WEIGHTS AND MEASUEES. 

 An Address delivered before the Convocation of the University of 

 the State of New York, at Albany, August, 1871. By Feedeeick 

 A. P. Baknaed, President of Columbia College, New York City. 

 Second edition from the Eevised edition printed for the Trustees 

 of Columbia College. Tinted paper. 



" It is the best summary of the arguments in favor of the metric weights 

 and measures with which we are acquainted, not only because it contains in 

 small space the leading facts of the case, but because it puts the advocacy of 

 that system on the only tenable grounds, namely, the great convenience of a 

 decimal notation of weight and measure as well as money, the value of inter- 

 national uniformity in the matter, and the fact that this metric system is 

 adopted and iu general use by the majority of civilized nations." — The Nation- 



The Toung Mechanic. 



Illustrated. 12mo. Cloth. $1.75. 



THETOTTNG MECHANIC. Containing directions for the use 

 of all kinds of tools, and for the construction of steam engines 

 and mechanical models, including the Art of Turning in Wood 

 and Metal. By the author of "The Lathe and its Uses," etc. 

 From the English edition, with coirectioas. . 



