42 SCIENTIFIC B QKS JP UJ3LISIIED J3 T 



Ernst's Manual of Military En- 

 gineering. 



193 Wood Cuts and 3 Lithographed Plates. 12mo. Cloth. $5.00. 



A MANUAL OF PRACTICAL MILITARY ENGINEER- 

 ING. Prepared for the use of the Cadets of the U. S. Military 

 Academy, and for Engineer Troops. By Capt. 0. H. ERNST, 

 Corps of Engineers, Instructor in Practical Military Engi- 

 neering, U. S. Military Academy. 



Church's Metallurgical Journey. 



" 24 Illustrations. 8vo. Cloth. $2.00. 



NOTES OF A METALLURGICAL JOURNEY IN' 

 EUROPE. By JOHK A. CHURCH, Engineer of Mines. 



Blake's Precious Metals. 



8vo. Cloth. $2.00. 



REPORT UPON THE PRECIOUS METALS : Being Statisti- 

 cal Notices of the principal Gold and Silver producing regions 

 of the World. Represented at the Paris Universal Exposi- 

 tion. By WILLIAM P. BLAKE, Commissioner from the State 

 of California. 



Clevenger's Surveying. 



Illustrated Pocket Form. Morocco Gilt. $2.50. 



A TREATISE ON THE METHOD OF GOVERNMENT 

 SURVEYING, as prescribed by the United States Congress, 

 and Commissioner of the General Land Office. With com- 

 plete Mathematical, Astronomical and Practical Instructions, 

 for the use of the United States Surveyors in the Field, and 

 Students who contemplate engaging in the business of Public 

 Land Surveying. By S. R. CLEVEKGER, U. S. Deputy Sur- 

 veyor. 



" The reputation of the author as a surveyor guarantees an exhaustive 

 treatise on this subject." Dakota Register. 

 " Surveyors have long needed a text-book of this description. The Press. 



