Some gerania, aloes, ficoids, &c. which are propagated from a leaf either artificially planted or even dropping from the parent plant, reſemble the tænia whoſe joints or whoſe veſicles are ſeparated and form a perfect animal: yet each is alſo propagated in the ordinary way from an egg or ſeed; and we need not, without neceſſity, have recourſe to ſuch indiſcriminate arbitrary methods of cutting the knot which we may be able to untie.