The German botanists regard these vegetable germs as belonging to the animal kingdom. Considering that only animals have the organs of motion, and that the spores of algæ and the impregnating corpuscles of mosses and ferns are provided with organs of motion, they do not hesitate to declare that in the commencement of their life, algæ, mosses, and ferns are in truth animals, which become plants when they fix themselves, and begin to germinate. French botanists have not yet ventured to adopt that view; they are content to call the movable impregnating corpuscles of algæ, mosses, and ferns, _antherozoïdes_, but they do not dare to pronounce upon their animality. M. Pouchet says, in his work _L'Univers_, page 444: "Motion manifests itself spontaneously with extraordinary intensity in the _animalculæ_ of several plants, which have spinal organs for this purpose, hairs by means of which they swim about in the liquid which contains them. "Some of these, real animalcule plants, have the shape of eels, and move themselves by means of two long filaments attached to their heads; others exactly resemble the tadpoles of frogs, and jump about in the cells of the mosses. "Nevertheless, it is such creatures as these, whose locomotive organs are so plainly to be discerned, and which we can see, under the microscope, jumping about as nimbly as our acrobats, that certain botanists persist in considering, on theory alone, as motionless and insensible. Some philosophers certainly possess eyes, that they may not see!" There are these germs of plants, and young plants which move, and on the other hand, almost all the adult zoophytes, sponges, corals, madrepores, sea-stars, byssus, &c., &c., to which we may add several mollusca (all those in shells), are fixed to the earth. In these cases we must take the plant for the animal, and the animal for the plant, if we positively hold by voluntary motion as an absolute distinction between animals and plants. On the borders of the two kingdoms,--when we consider zoophytes in the animal, and cryptogams in the vegetable kingdom,--there is no longer, so to speak, either animal or plant; the two seem to be confounded, and fused together.