The Climate of Siberia in the Mammoth Age

Abstract

PROF. A. NEWTON, in his remarks on my letter, says that the similarity of the birds of Japan and of Europe has been long known. Of course it has. It is an elementary postulate in geographical zoology; but this is not the fact to which I called special attention, and from which I drew my inference. That fact is that, while the birds of Japan and England are in certain species undistinguishable, the corresponding birds of Siberia are sufficiently different to be classed as separate species. This could not be known, in the sense of being proved, until the avifauna of Siberia had been worked out from end to end, resulting in the formation of such a continuous series of skins as that in the possession of my friend Mr. Seebohm.