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In some living organisms such as insects, especially the ephemerid� who have but a brief existence, this change of substance is even more rapid than that in an osmotic growth.

Swift as the swallow, and more true of aim, the great trout made one dart, and a sound, deeper than a tinkle, but as silvery as a bell, rang the poor ephemerid's knell.

Those who play a waiting game have matters more in their own hands, time gives them double chances; whereas if success does not come at once to the ephemerid he misses it altogether.

Already, in the case of the ephemerids, nature has produced a complete cycle of normal life ending in natural death.