INTRODUCTION.--Money in the Rocks--The Underground Wealth of our Country--Valuable Minerals Disguised--How Great Fortunes are Missed--Number of Minerals in the United States--Object of this Work and How to Use it--The Best Mineral Regions.....9 DIRECTIONS FOR DETERMINING SPECIMENS BY THE KEY.--How to Test Minerals with the Simplest Means--Prospecting with a Jack-knife and Common Sense--Use of the Key--How to Tell Pyrites from Gold, and Quartz from Diamond--All the Useful Minerals Grouped According to Hardness and Color.....15…
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