Scattered among them will sometimes be crowds of little wheels, surrounded with double-ended hooks. These have no motion and we shall probably pass them by as minute burrs or seeds of some water plant. But they, too, are winter buds of a strange group of tiny animals. These are known as Polyzoans or Bryozoans; and though to the eye a large colony of them appears only as a mass of thick jelly, yet when placed in water and left quiet, a wonderful transformation comes over the bit of gelatine.... "Perhaps while you gaze at the reddish jelly a pink little projection appears within the field of your lens, and slowly lengthens and broadens, retreating and reappearing, it may be, many times, but finally, after much hesitation, it suddenly seems to burst into bloom. A narrow body, so deeply red that it is often almost crimson, lifts above the jelly a crescentic disc ornamented with two rows of long tentacles that seem as fine as hairs, and they glisten and sparkle like lines of crystal as they wave and float and twist the delicate threads beneath your wondering gaze. Then, while you scarcely breathe, for fear the lovely vision will fade, another and another spreads its disc and waves its silvery tentacles, until the whole surface of that ugly jelly mass blooms like a garden in Paradise--blooms not with motionless perianths, but with living animals, the most exquisite that God has allowed to develop in our sweet waters." At the slightest jar every animal-flower vanishes instantly. A wonderful history is behind these little creatures and very different from that of most members of the animal kingdom. While crabs, butterflies, and birds have evolved through many and varied ancestral forms, the tiny Bryozoans, or, being interpreted, moss-animals, seem throughout all past ages to have found a niche for themselves where strenuous and active competition is absent. Year after year, century upon century, age upon age, they have lived and died, almost unchanged down to the present day. When you look at the tiny animal, troubling the water and drawing its inconceivably small bits of food toward it upon the current made by its tentacles, think of the earth changes which it has survived.