and satisfactorily accounts for them all, whether it originally came from Aristotle, from Plato, or from Moses, is a matter of comparatively slight moment, so far as the scientific world is concerned. At least, it would seem so to us. But to talk of the _de novo_ origin of "living matter" as the result of the dynamic force of molecules--themselves concessively "dead matter"--is to indulge in quite as fanciful a speculation as the advocates of the panspermic hypothesis have ever ventured to suggest. Professor Bastian is forced to go back of his infusorial forms and fungus-germs to a microscopical "pellicle," from which he admits they are "evolved." But why evolved? Does not the principle of vitality lie back of the pellicle, as well as the fungus-germ? How absolutely certain is he that the extremest verge of microscopic investigation has been attained, in what he is pleased to designate "primary organic forms?" "Evolution" is a very potential word, and no one may yet know what boundless stores of absurd theory and metaphysical nonsense are locked up in it![23] He admits that "evolution," as embracing the idea of "natural selection," can have nothing to do with the vast assemblage of infusorial and cryptogamic organisms, until they assume definitely recurring forms, that is, rise into species and breed true to nature. Then, he agrees with Mr. Darwin, that the law of vital polarity or "heredity," as he calls it, may come in and play its part towards effecting evolution, or variability, in both animal and vegetal organisms, but not before. Why then should he lug in, or attempt to lug in, the diverse potentialities of this word "evolution," for the purpose of demonstrating the dynamic law governing the developmental stages of his microscopic pellicle? This, he will agree, lies far below the point, in primary organism, where specific identity, or the law of heredity, asserts its full recognition. All below this developmental point is inconstancy of specific forms, with no line of ancestry to be traced anywhere.