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It is easy, too, to obtain direct proof of this absorption of a great part of the evolved oxygen by the animal tissues through which it has to pass. Velella 24 per cent., white Gorgonia 24 per cent., Ceriactis 21 per cent., while Anthea, which contains most algae, gave from 32 to 38 per cent. This difference is naturally to be accounted for by the avidity for oxygen of the animal cells.
Two varieties of Ceriactis aurantiaca, one with, the other without, yellow cells, were next exposed, with a precisely similar result. The former never failed to yield abundant gas rich in oxygen, while in the latter series not a single bubble ever appeared.
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