The Popular Science Monthly, Volumen22

action American amount animals appears argillite Aristotle asphalt astronomical average become bitumen body bones called cause cells census cent centimetres character comet constitution course disease effect electric Eocene evidence evolution philosophy existence experiments fact favor feet G. P. Putnam's Sons geological give heat Herbert Spencer human hundred ical important increase influence interest labor less light living Lobsann manure matter means ment method miles Miocene moral nature nearly nitrogen observations organization origin ovaries period persons photosphere physical plants Pleistocene political pounds practical present principle probably produced Professor question race regard relations scientific sepals social society solar species Spencer stamens Stockbridge substance temperature theory things tion trees universal vivisection whole York