Note 422 — Chapter I

F. Unger, Die versunkene Insel Atlantis (Wien, 1860). Translated in the Journal of Botany (London), January, 1865. Asa Gray had already called attention to the remarkable resemblance between the flora of Japan and that of eastern North America, but had not found the invention of a Pacific continent preferable to the hypothesis of a progress of plants of the temperate zone round by Behring’s Strait (Memoirs of the American Academy of Arts and Sciences, vi. 377). Unger’s theory has been also more or less urged in Heer’s Flora Tertiaria Helveticae (1854-58) and his Urwelt der Schweitz (1865), and by Otto Ule in his Die Erde (1874), i. 27.