Science for All, เล่มที่ 2-3

action animals appear atmosphere becomes beds birds body boiling Butterwort called carbonic acid cause cells centre chemical clay coal colour contain Copernicus direction distance earth effect electricity examine experiment fact feet felspar fermentation flame flask flesh-forming fluid force fossils geyser glacier glass granite heat hills hydrogen inches insects Irish elk kind known lakes leaf leaves less light lignite limestone liquid living mass matter means ment mercury microscope miles moon moon's motion moving nature object observed optical illusions ordinary organs oxygen particles pass phenomena phosphorus piece plants portion position present pressure produced Pterodactyles quadrupeds quantity river rock roots round sacculina seen shells side skeleton sleep soil solid sound sponge starch stars steam stone substance supposed surface temperature tion tube valleys vessel weight whilst wire