Radical as these last two suggestions are in point of time, they are conservative compared with theories held by A. A. Mendes Correâ and Paul Rivet. Like many another student, Mendes Correâ saw Australian, Caucasoid, Polynesian, Melanesian, and Asiatic affinities among the American Indians; but he struck into a new field of theory in 1926 by transporting the Australians to South America over a now-vanished land-bridge to the south. Using Wegener’s hypothesis of the drift of continents, he found his bridge in a severed and displaced Antarctica. He conceded that this was only a conjecture, but thought it “very probable.”[19] That same year Rivet—approving migrations of Australian, Malayan-Polynesian, Asiatic, and Ural elements—suggested that glaciation in the southern hemisphere might have aided the Australians in passing from island to island until they reached the mainland of South America.[20] He dated their journey at only 6,000 years ago,[21] so that glacial assistance beyond the present extent of Antarctica seems just a little unlikely. Rivet, following many a student from Leibnitz to Thomas Jefferson, proposed to trace the origin of the American peoples through comparing their languages with those of the Old World. In 1925 he came up with something more than the usual random identities between words.[22] Indeed, the parallels which he drew between the present speech of the Tshon of Patagonia and the Australians seemed to Dixon to be impossibly close after centuries upon centuries of separation from one another and of contact with other peoples.[23] Only sheer coincidence could account for such identity. There remain two champions of multiform and multitudinous migrations—José Imbelloni of Argentina and Harold S. Gladwin. They go further than any of their predecessors in peopling the New World with varied races, and further in advancing transpacific migrations as an important factor in the history of the Americas. Pygmies Before Australoids in the New World? Both Imbelloni and Gladwin begin with a suggestion that Pygmies deserve consideration. These primordial migrants trod their tiny paces from some unknown fatherland to the forests of the Congo and the jungles of New Guinea, to islands like the Andamans and possibly to Tasmania. The presence of five-foot Yahgan in Tierra del Fuego suggests to both Imbelloni and Gladwin that Pygmies may have preceded the Australoids to the New World. The advent of Pygmies in Tierra del Fuego as well as in Tasmania may be open to question; for in both places the natives, though short, exceeded the average of Pygmy height by a few inches, and their heads, instead of being round like those of the Pygmies, are recorded as of medium cephalic index.