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active atomic Australia birds Breccia Buller Buller Gorge Canterbury Canterbury Museum carbon Cawthron Institute century chemical civilisation clay climate coffinite craters crop culture deposits discovery disease disorder drilling early energy epidemic Euryapteryx evidence fact favourable forest hospital human figures ignimbrite important increase industry J. J. Thomson Kaitaia knowledge laboratory Larderello lecture lunar manaia Maori material means measure ment methods miles mineral wealth Moa-hunter moon mosquitoes natural Nelson Nelson College neutrons North Island nuclear observations organic matter Otago particles period physical plant Polynesian pores possible present problem production Pyramid Valley radiation radioactive rock Rotorua Rutherford samples sand scientific scientists Scott Base Skelton Glacier soil South spirals steam structure subnormal surface swamp temperature thermal THOMAS CAWTHRON tilth tion uranium virus volcanic Wairakei yellow fever Zealand