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It is a forest of glass bells, on branching stalks. They are Vorticellae; and every one of those bells, by the ciliary current on its rim, is scavenging the water till a tadpole comes by and scavenges it. How many millions of living creatures are there on that one sprig? Look here! a brown polype, with long waving arms a gigantic monster, actually a full half-inch long.
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