The enormous and increasing consumption of petroleum of various qualities in this country has created a special interest in this useful natural product, and the author has met with frequent inquiries from users of oil outside the trade as to its origin, manner of production, and mode of preparation. The following pages have been written with a view to giving some general information on the subject. It has not been attempted to compile a text-book, but simply to collect a few facts about petroleum which mav prove of interest to the reader.

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