9 

 A TREATISE OH A BOX OF niSTEUMENTS, 



And the Slide Rule, witli the Tlieory of Trigonometry and 

 Logarithms, including Practical Geometry, Surveying, Measur- 

 ing of Timber, Cask and Malt Gauging, Heights and Distances. 

 By Thomas Kentish. In One Volume, 12mo. $1. 



THE LOCOMOTIVE ENGINE: 



Including a Description of its Structure, Rules for Estimating 

 its Capabilities, and Practical Observations on its Construction 

 and Management. By Zerah Colburn, 12mo 75 cts. 



SYLLABUS OF A COMPLETE COUESE OF LEC- 

 TURES ON CHEMISTRY: 



Including its Application to the Arts, Agriculture, and Mining, 

 prepared for the use of the Gentlemen Cadets at the Hon. E. I. 

 Co.'s Military Seminary, Addiscombe. By Professor E. Solly, 

 Lecturer on Chemistry in the Hon. E. I. Co.'s Military Seminary. ■ 

 Revised by the Author of "Chemical INIanipulations." In one 

 volume, octavo, cloth. $1.25. 



THE ASSAYER'S GUIDE ; 



Or, Practical Directions to Assayers, Miners, and Smelters, 

 for the Tests and Assays, by Heat and by Wet Processes, of the 

 Ores of all the principal Metals, and of Gold and Silver Coins 

 and Alloys. By Oscar M. Lieber, late Geologist to the State 

 of Mississippi. 12mo. With Illustrations. 75 cts. 



THE BOOKBINDER'S MANUAL, 



Complete in one Volume, 12mo. (in press.) 



