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GROWTH OF CORAL.
225
BRANCHING CORAL.
can be no doubt that some localities and positions are more favourable to the growth of coral than others. Dr. Allan, while at Madagascar, made several experiments to test this. He selected several masses of coral, each weighing about ten pounds, and of different species. These he placed three feet below the surface of the sea, and staked them in to prevent removal. In a little more than six months
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