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PHOTOGRAPHING FISHES.

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PHOTOGRAPHING FISHES. For some long time photographers hivo, made a keen study of the colours and patterns of fishes in relation to their haLits. Recently Professor Longley visited Hawaii, equipped with a diving- hood, submarine cameras and apparatus for cotour jdiotography, and continued his investigations in a coral reef region Island. His work often required him to remain four or five hour-, at a time under water of considerable depth. He has been successful in securing accurate submarine colour photographs, but only after much experimenting. He finds that the screens used for colour photo- graphy in the air are not suita,ble for use under water. It is neoessary, he says, that a special serce-n stopping more of the rays of shorter wave-length than is required in air should be used in submarine colour photography, and even then the best results at a given depth and time could probably be obtained by its use at only one distance from the object photographed. Hawaiin fishes show a marked capacity for changing their coloration with change in surround- ings or activities. That great developments may be expected in colour photography in the near future is certaic.

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