THE MINERAL RESOURCES . OF THE UNITED STATES.
It has been said with much truth that" the geological resources of the United States include a greater variety of economically valuable substances than has 45 yet been found within an equal area in the other parts of the world." This statement is richly illustrated by the two massive volumes, containing over fourteen
hundred pages, in which_ is contained the sixth part of the United States Geological Survey's Annual Report for 1898=90. This treatise, which is the fifteenth of the series to which it belongs, describes The Mineral Resources of the United States, 1899, and has been produced under the competent direction of Mr. David T. Day. It carries a complete statistical account of the "mineral development" of the States down to the end of that year, and also contains many useful figures with regard to other countries. One may specially note articles on the iron trade of the world, on petroleum, natural gas, and the precious stones of the States. There is further a description of the mineral resources of Puerto Rico, which, as at present known, appear to be like the achievements of the early Greeks, "no very great things."
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