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Agriculture alcohol lamp alkali soils ammonia animals atoms of oxygen beans birds bottle Bulletin burn California called capillary carbon dioxide cell child chlorophyll College color compounds contain corn counties course of study dissolved earth elements evaporation excursion experiment fact field flame garden geography glass tube grades growing plant heat hydrogen hygroscopic illustrated inch insects interest iodine kind leaf leaves lime water litmus paper material membrane minutes moisture molecule nature Nature-Study Review nitric acid nitrogen Normal School observed odor osmosis oxide oxygen paper birch paraffine particles pass phosphoric acid phosphorus physical piece plant foods plant propagation Plants Need potash potassium practical pupils roots school-garden seeds sodium soil solution spool starch stem stomata substances sugar sulphur surface taken teachers teaching thermometer things trees various vaseline weeds wood young plant