22 SCIENTIFIC BOOKS PUBLISHED BY 
Barnes’ Submarine Warfare. 
8vo. Cloth. $5.00. 
SUBMAEINE WAEFAEE, DEFENSIVE AND OFFENSIVE. 
Comprising a full and complete History of the Invention of the 
Torpedo, its employment in War and results of its use. De- 
soriptions of the various forxns of Torpedoes, Submarine Batteries 
and Torpedo Boats actually used in War. Methods of Ignition 
by Machinery, Oontaot Fuzes, and Blectrieity, and a full aceount 
of expöriments made to determine the Explosive Force of Gun- 
powder under Water. Also a diseussion of the Offensive Torpedo 
System, its effect upon Iron-Glad Ship Systems, and influenee upon 
■ Future Naval Wars. By Lieut.-Commander John S. Barnes, 
U. 8. N. With twenty lithogra.phic plates and many wood-cuts. 
“ A book important to military men, and especially so to engmeers and ar- 
tillerists. It eonsists of an examination of the various offensive and defensive 
engines that have been conirived for submarine hostilities, including a disous- 
sion of the torpedo System, its effeets upon iron-elad ship-systems, and its 
probable influenee upon future naval wars. Plates of a valuable character 
accompany the treatise, which affords a useful history of the momentous sub- 
ject it discussea. A great deal of useful information is collocted in its pages, 
especially conceming the inventions of Scholl and Veruu, and of Jones’ 
and Hunt's batteries, as well as of other similar machines, and the use in 
submarine Operation» of gun-cotton and nitro-glycerine.”—N. Y. Times. 
Randall’s Quartz Operator’s Hand- 
Book. 
12mo. Cloth. $2.00. 
QUABTZ OPEBATOB’S HAND-BOOK. By P. M. Bandall. 
New edition, revised and enlarged. Fully illustrated. 
The object of this work has been to present a clear and comprehensive ex- 
pjsition o£ mineral veins, and the means and modes chiofly employed for the 
miaing and working of their ores—more especially thoae containing gold and 
silver.