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alternating current animal cages animal house Appendix aquaria aquarium Average floor area Average wall area blackboards bulbs bulletin boards Bunsen burner cent chemical class meetings courses of study curriculum analysis darkroom demonstration tables direct current earthworm electrical outlets elementary schools elementary science rooms equipment and supplies floor space free floor fundamental experiences fundamental interactions furnishings glass grade schools growing rooms indicate insect intermediate grade science intermediate grade teachers lantern slides lecture-demonstration tables light fixture located magnet material facilities microscope museum Nature Study necessary needed objects physical science plants radiators recitation rooms recitation-or-laboratory room recitation-plus-laboratory rooms rooms in teachers rooms studied schools studied science rooms studied seeds serviced with hot sink storage cabinets storage units studied in teachers teachers colleges studied teachers in science terraria thermometer training intermediate grade training of intermediate tubing types of rooms various wall space wall tables wire wood York