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advantageous advisable amount angle atmosphere back wall bars blinds boiler border bottom brick brick-work carbonic carbonic acid Carriage Paid chimney circulation cistern column combustion conservatory constructed convection convenient course drainage drip dwarf walls easily external air Fahr Fahrenheit fixed flue frames frequently front fuel furnace gallons glass glazing green-house ground growing-houses gutter hard water heating apparatus heating pipes heating surface horizontal horticultural buildings hot water hot-water pipes hygrometer inches inside iron latter lean-to house length liable lights material moisture mullions necessary obstruction ordinary paint panes path pitch of roof placed plants purlins purposes putty radiating pipes rafters ridge ridge and furrow rise sash-bars shown by Fig side soil solar rays space span square stoke-hole stove sun's rays Table temperature thermometer tiered stage usually valves ventilators vertical height vinery width winter garden wires wood wood-work zinc