14 SCIENTIFIC BOOKS PUBLISHED BY 



Williamson on the Barometer. 



4to. Cloth. $15.00. 



ON THE USE OF THE BAROMETER, ON SUEYEYS AND 

 RECONNAISSANCES. Part I. Meteorology in its Connec 

 tion with. Hypsometry. Part II. Barometric Hypsometry. By 

 E. S. WILLIAMSON, Bvt. Lieut.-Col. U. S. A., Major Corps of 

 Engineers. With. Illustrative Tables and Engravings. Paper 

 No. 15, Professional Papers, Corps of Engineers. 



&quot; SAN FRANCISCO, CAL., Feb. 27, 18G7. 

 &quot; Gen. A. A. HUMPHREYS, Chief of Engineers, U. S. Army : 



&quot; GENERAL, I have the honor to submit to you, in the following pages, the 

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

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

 ment for determining altitudes on extended lines of survey and reconnais 

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

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

 deemed of sufficient value to have a place assigned them among the printed 

 professional papers of the United States Corps of Engineers. 

 &quot; Very respectfully, your obedient servant, 



&quot;R. S. WILLIAMSON, 

 &quot;Bvt. Lt.-Col. U. S. A., Major Corps of U. S. Engineers.&quot; 



Yon Cotta s Ore Deposits. 



8vo. Cloth. 04.00. 



TREATISE ON OEE DEPOSITS. By BERNHARD YON COTTA, 

 Professor of Geology in the Royal School of Mines, Freidberg, 

 Saxony. Translated from the second German edition, by 

 FREDERICK PRIME, Jr., Mining Engineer, and revised by the 

 author, with numerous illustrations. 



&quot; Prof. Von Cotta of the Freiberg School of Mines, is the author of the 

 best modern treatise on ore deposits, and we are heartily glad that this ad 

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

 lator, Mr. Frederick Prime, Jr., a graduate of Freiberg, has had in his work 

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

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

 own book. 



&quot; It is a timely and welcome contribution to the literature of mining in 

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

 judgment in undertaking its preparation ; while we recognize with equal cor 

 diality the liberality of the author in granting both permission and assist 

 ance.&quot; Extract fro in Review in Engineering ami Mining Journal. 



