The Popular Science Monthly, เล่มที่ 40

50 cents American animal appears astronomy bacteria Bartram Bessemer Bessemer process birds body Boston Brazil cable railways census cent century Ceramic Art chemical chemistry Church cities coccyx color Copernican Copernicus cultivated earth electric England Europe experiments fact feet Galileo give given hundred idea illustrated increase instrument interest invention iron island John Bartram known labor lava lecture machine manufacture means ment metal method miles movement musk ox natural observations organ original ornament paper patent period persons Philadelphia plants poisons population Port Royal pottery practical present produced Prof published question region scientific Society species spiegeleisen square miles steel tail teachers teaching theory thousand tion university extension usury ware whole York