14 SCJEKTIFIC BOOKS PUBLISHED BY 



■Williamson on the Barometer. 



4to. Cloth. $15.00. 

 ON THE USE OE THE BAEOMETEE, ON SITRYETS AN] 

 EECONNAISSANCES. Part I. Meteorology iu its Connec 

 tion with Hypsometry. Part II. Barometric Hypsometry. B 

 ,E. S. WiLLiAMso::?, Bvt. Lieut-Col. TJ. S. A., Major Corps c 

 Engineers. "With Illustrative Tables and Engravings. Pape 

 No. 15, Professional Papers, Corps of Engineers. 



" San Francisco, Cal., Feb. 27, 1867. 

 " Gen. A. A. Humphkets, Chief of Engineers, U. S. Army : 



" General, — I have the honor to submit to you, in the following pages, tl 

 results of my investigations in meteorology and hypsometry, made with tl 

 view of ascertaining how far the barometer can be used as a reliable instn 

 ment for determining altitudes on extended lines of survey and reoonnaii 

 sances. These investigations have occupied the leisure permitted me from m 

 professional duties during the last ten years, and I hope the results will t 

 deemed of suf&cient value to have a place assigned them among the printe 

 professional papers of the United States Corps of Engineers. 

 " Very respectfully, your obedient servant, 



" E. S. WILLIAMSON, 

 "Bvt. Lt.-Col. TJ. S. A., Major Corps of U. S. Engineers." 



Yon Cotta's Ore Deposits. 



8vo. Cloth. $4.00. 

 TREATISE ON OEE DEPOSITS. By Beenhaed Von Cottj 

 Professor of Geology in the Eoyal School of Mines, Preidberg 

 Saxony. Translated from the second German edition, b 

 FfiEDEHiCK Pbime, Jr., Mining Engineer, and revised by tb 

 author, with numerous illustrations. 



" Prof. Von Cotta of the Freiberg School of Minos, is the author of tl 

 best modem treatise on ore deposits, and we are heartily glad that this ac 

 mirable work has been translated and published in this country. The trani 

 later, Mr. Frederick Prime, Jr., a graduate of Freiberg, haa had in hia wor 

 the great advantage of a revision by the author himself, who declares in 

 prefatory note that this may be considered as a new edition (the third) of hJ 

 own book. 



*' It is a timely and welcome contribution to the literature of mining i 

 this country, and we are grateful to the translator for his enterprise and goo 

 judgment in undejtalcing its preparation ; while we recognize with equal co: 

 diality the li1j§rality of the author in granting both permission and aasis 

 ance." — JSietract from Beview in Engirieering and Mining Journal, 



