The Story of a Piece of Coal: What it Is, Whence it Comes, and Whither it Goes

72 Fifth Avenue Acrogens America ammonia amongst amount aniline dyes aniline oil anthracite atmosphere bark become beds of coal beneath benzene bituminous bituminous coal Calamites carbonic acid carboniferous caused cent charcoal chemical clay club-mosses coal-bearing coal-beds coal-field coal-measures coal-mine coal-seams Coal-shale coal-tar coke colour combustion compounds conifers contained Davy lamp deposited diamond distillation encrinites existence explosion fact feet of coal feet thick fire-damp flame forest formation formed fossil fractional distillation fuel gases graphite heat hydrogen illuminating Illustrations impurities iron known lamps land layer Lepidodendron less lignite lime mass matter mineral mines naphtha nature nitrobenzene numerous obtained owing paraffin peat Pecopteris plants production quantity result retorts river sand sandstone seams of coal sediment shaft shale sigillaria species spores square miles stem Stigmaria strata substance sulphuric acid supplies surface tion toluidine trees trunk underclays various vegetable ventilation volatile whilst