Professor Gray may insist that such a phenomenon as this requires belief in the supernatural, and that migration by ocean-currents is the more rational theory of the two. But M. Alphonse de Candolle--quite as high authority as we can quote--has come to the conclusion that marine currents, and all other suggested means of distant transportation, "have played only a very small part in the actual dispersion of species," even across narrow channels and the near arms of seas. But why should the appearance of this fern at opposite points of the globe, with thousands of miles of ocean and continent intervening, be any more supernatural than the presence of _Bacteria_ or _Torulæ_[17] in different organic infusions? If the vital units of these _infusoriæ_, are present in experimental infusion, as Professor Bastian virtually admits, why may not the vital germs or units of this _Schizoea pusilla_ have made their appearance, in developmental forms, both in New Zealand and New Jersey, at the same or different periods of time? If Professor Gray regards the microscopical forms in organic infusions, or the statical forms in inorganic solutions, as supernatural, or as above the powers of nature, then we have no exceptions to make to his position. First, prove that these vital manifestations of nature are above the powers with which she has been endowed, or was originally endowed and we will concede the question of supernaturalness, and drop all exceptions to his line of argument. Whenever a dynamic law, or a statical, is found to be uniformly operative under a given set of conditions, we had supposed the operation not to be above the powers of nature, but in entire accord with them, and hence not supernatural.