24 SCIENTIFIC BOOKS PUBLISHED BY 



Silversmith's Hand-Book. 



Fourth Edition. 



Illustrated. 12mo. Cloth. $3.00. 



A PRACTICAL HAND-BOOK FOR MINERS, Metallurgists, 

 and Assayers, comprising the most recent improvements in the 

 disintegration, amalgamation, smelting, and parting of tho 

 Precious Ores, with a Comprehensive Digest of the Mining 

 Laws. Greatly augmented, revised, and corrected. By JULIUS 

 SILVERSMITH. Fourth edition. Profusely illustrated. 1 vol. 

 12mo. Cloth. $3.00. 



One of the most important features of this work is that in -which the 

 metallurgy of the precious metals is treated of. In it the author has endeav- 

 ored to embody all the processes for the reduction and manipulation of the 

 precious ores heretofore successfully employed in Germany, England, Mexico, 

 and the United States, together with such as have been more recently invented, 

 and not yet fully tested all of which are profusely illustrated and easy of 

 comprehension. 



Simms' Levelling. 



8vo. Cloth. $2.50. 



A TREATISE ON THE PRINCIPLES AND PRACTICE OF 

 LEVELLING, showing its application to purposes of Railway 

 Engineering and the Construction of Roads, &c. By FREDERICK 

 "W. SIMMS, C. E. From the fifth London edition, revised and 

 corrected, with the addition of Mr. Law's Practical Examples for 

 Setting Out Railway Curves. Illustrated with three lithographic 

 plates and numerous wood-cuts. 



" One of the most important text-books for the general surveyor, and there 

 is scarcely a question connected with levelling for which a solution would be 

 sought, but that would be satisfactorily answered by consulting this volume." 

 Mining Journal. 



" The text-book on levelling in most of our engineering schools and col- 

 leges." Engineers. 



"The publishers have rendered a substantial service to the profession, 

 especially to the younger members, by bringing out the present edition of 

 Mr. Simms' useful work." Engineering. 



