4. Sir J. Hector exhibited—(1) a sample of an unusual form of guano from the islands (exact locality not stated). It contains about 40 per cent. of broken and entire marine shells, cemented together in blocks by carbonate of lime, and 41.88 per cent. of tri-calcic phosphate. It should prove a very useful manure when ground to the same degree of fineness as the samples exhibited.
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Transactions and Proceedings of the Royal Society of New Zealand, Volume 25, 1892, Page 541
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66Notes on Guano from the Islands. Transactions and Proceedings of the Royal Society of New Zealand, Volume 25, 1892, Page 541
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