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 described by Mr. Ehrenberg. What has been hitherto called division of individuals was only animalcules, parts of a whole or of a chain of animals. I never saw new limbs growing upon one of the animalcules separated from the chain; I never saw any one turning double, and consequently propagating itself either by a longitudinal or transversal division, nor after such a separation, artificially or violently executed, protracting its life, and still less, maintaining it, recuperating its individuality, and producing new animalcules of its own species.

The Oscillatoriae dissolve themselves in the already deceased lower parts, but a new animalcule never arises out of the fragments separated from that part. After having cut the filaments of the Oscillatoriae, I saw the one to which a part of the head was joined, creep, grow and continue to live, whilst the lower part, which had been cut, formed no new head, died, discoloured and discomposed itself.

In a series of observations, continued during several months, the Cosmarium stellinum alone presented an exception. After both animal bodies, half of which is represented (fig. 22. A.), are separated, a new sprout (fig. 22. B.) issues from the axe of each body. This sprout, at first round, exhibits later the first or principal incisions of its body, and afterwards those of the second and third rank. All the points and cuts are still obtuse and rounded; among the 52 points coming on each side of the body, 19 only are developed, which, divided later by new