Heating of Journals. Spinning Cotton in the South. Powder versus Dynamite. How to Search for Metals. SEARCHING FOR GOLD. SEARCHING FOR SILVER. SEARCHING FOR COPPER. SEARCHING FOR LEAD. SEARCHING FOR IRON. [Dental Cosmos.) Treatment of Exposed Dental Pulps. BY DR. C. R. FRANCIS. Aerial Navigation. Improvement in the Manufacture; of Sul phuric Acid. The Purification of Rivers., scientific american, 1873-03-01
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