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Academy American ancestors ancient animals average barley Battas begu bones cave cave-men cent character chemical chemistry civilization connected considerable cowries crops diphtheria diseases drainage effect electric Eocene Esquimaux Europe evidence existence experiments extinct fact favorable feet flints forests G. C. Lewis gases germs Gulf Stream heat Herodotus hippopotamus human hundred important increase influence investigation Irish elk leguminous light lion living manures matter measure ment mid-Miocene Miocene modern nature Neanderthal neolithic nitrogen nitrogen per acre observed organization palaeolithic period phenomena physical plants Pleistocene Pliocene plots plumbers plumbing pounds of nitrogen practical present principle probably Professor Wurtz question race regard relations remarkable reports river-drift Rothamsted sanitary engineers says scientific sewer-gas sewers Society soil species STEPHEN PEARL ANDREWS Thenay theory tion trees typhoid fever unit vegetable whole Wingate yield of nitrogen