Grotius first confutes those, who think that the people of America came from Great Tartary, because they had no horses before the Spanish conquest, and that it is impossible the Scythians, who abounded in horses, should bring none with them; besides the Tartars were never seamen. His opinion is, that North-America was peopled by persons from Norway, from whence they passed into Iceland, afterwards into Greenland, from thence to Friseland, then to Estotiland, a part of the American continent, to which the fishers of Friseland had penetrated two centuries before the Spaniards discovered the New World. He pretends, that the names of those countries end with the same syllables as those of the Norwegians; that the Mexicans and their neighbours assured the Spaniards they came from the North; and that the country which the Norwegians inhabited, after quitting Estotiland, has retained almost the name of Norway; that there is yet a town in it called Norembega; in fine, that there are many words in the American language, which have a relation to the German and Norwegian; and that the Americans still preserve the customs of the country from whence they are originally sprung. As to the people of Jucatan, and the neighbourhood, Grotius makes them come from Ethiopia by the way of the Ocean. He grounds this opinion on the practice of circumcision among these nations of America, which was also used by the Ethiopians. He pretends that the Peruvians are descended from the Chinese, because the wrecks of Chinese vessels have been found, he says, on the coasts of the Pacific Ocean, and they worship the sun: besides, the Peruvians, he adds, write from the top to the bottom of the page like the Chinese. Laet easily shewed that Grotius's conjectures were ill founded, and that he had even advanced several facts which were not strictly true: he denied the existence of the city of Norembega, and maintained that Jucatan is too distant from Africa for the Ethiopians to penetrate into America, it being at least two months sail from Ethiopia to Jucatan. He refutes the pretended traces of Christianity, which Grotius said were found in that part of America before the discovery of the Spaniards, supporting his confutation on the authority of Spanish writers; in fine, he denies that any Chinese wrecks have been found on the coasts of the Pacific Ocean, and censures, as a very great inaccuracy in Grotius, what he advances concerning the Peruvian manner of writing.