414 THE JOURNAL OF GEOLOGY. 



The Mineral Industry, its Statistics, Technology and Trade, in the United 

 States and Other Countries, from the Earliest Times to the End of 

 i8g2. Vol. I. Edited by Richard P. Rothwell, editor of the 

 Engineering and Mining Journal. 629 pp., 8vo. 

 This volume is a statistical supplement of the Engineering and Min- 

 ing Journal, and is published by the Scientific Publishing Co., of New 

 York, 1893. It takes the place of the former annual statistical num- 

 ber of the Engineering and Mining Journal, and it is the first volume 

 of a series which is to be issued annually. The object of the present 

 volume is to make known, as soon as possible after the expiration of 

 the year 1892, the statistics and the various conditions of the mining 

 industry in that year and in previous years. The future volumes will, 

 each year, bring these statistics up to date, and thus the full particulars 

 of the mining industry- will be known within a few days of the expiration 

 of every year. The volume is a compilation of articles written by 

 different authors, and the names of these writers are guarantee that the 

 different subjects have been treated by authorities in the departments 

 with which they deal. The editor himself, it is but justice to him to 

 state, has written some of the most important parts of the volume, nota- 

 .bly the article on the statistics of gold and silver, and his well-known 

 familiarity with the subjects he discusses renders the reader confident 

 of their accuracy. 



The present volume is not confined to the bare presentation of fig- 

 ures of production and consumption of various mineral products, but 

 it treats each individual branch of the mining industry in its various 

 departments ; and in this way the volume really represents a series of 

 treatises on the various mining products and the methods of treating 

 them. The production of each material is given not only for the United 

 States but also for foreign countries; the conditions of the American 

 and foreign markets during 1892 and previous years are discussed, 

 while the various uses of the different materials, the history of mining 

 in different districts, the means of transportation, the metallurgical 

 methods of treating different ores, the methods of sampling, and the 

 possibilities of competition in various mining industries are also 

 described. In addition to this, tables of assessments levied and divi- 

 dends paid by various mining companies are given. The volume ends 

 with a concise statement of the statistics and condition, as well as the 

 extent, of the mining industries of foreign countries. Thus there is 

 presented, in a volume of no excessive size, a complete and concise 



