24 SCIENTIFIC BOOKS PUBLISHED BY 



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Silversmith's Hand-Book. 



Fourth Edition. 



Illustrated. 12ino. Cloth. $3.00. 



A PEA.CTICAL HAND-BOOK FOE MINEES, Metallurgists, 

 and Assayers, comprising the most recent improvements in the 

 disintegration, amalgamation, smelting, and parting of the 

 Precious Ores, witli a Comprehensive Digest of the Mining 

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

 SiLVEESMiTH. 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 tlie United States, together with such as have heen more recently invented, 

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

 eomprehcnsion. 



Simms' Levelling. 



8vo. Cloth. $2.5n. 



A TEEATISE ON THE PEINCIPLES AND PEACTICE OF 

 LEVELLING, showing its application to purposes of Railway 

 Engineering and the Construction of Eoads, &c. By Feedekick 

 TV. Simms, C. E. From the fifth London edition, revised and 

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

 Setting Out Eailway 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 servioe to the profession, 

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

 Mr. Simms' useful work." — Engineering, 



