Zeilan or Taprobana; I am inclined to believe it was Taprobana.” His letter of May 10, 1549, also to Ramusio, is of special interest, indicating, as it does, his estimate of the value of terrestrial and celestial globes in the study of astrology (astronomy) and geography. “In regard to what you write me about M. Paolo, I thoroughly approve of his taking up the sacred study of astrology and geography, subjects of study for every learned gentleman and nobleman, as he would have as his guide and teacher the very well-known Piedmontese to whom we owe so many excellent things, but first I should advise you to have M. Paolo construct two solid spheres. On one of these should be represented all the celestial constellations, and the circles should all have their place, that is to say, not as Ptolemy represents the stars as they were located in his time, but according to the investigations of our own times, that is, about twenty degrees further east. The other should be a terrestrial globe constructed according to modern ideas, which he should always follow in his studies. He will use the first globe for a thousand and one things; it will be his guide by day and by night, and by making use of the quadrant he will be able easily to locate the things to be seen in the heavens. Then when he shall have been well started I want that you should have him read that little book of mine on homocentricity, wherein he will be able to learn what astrology is, but for the present let him learn ordinary astrology which has been treated in so barbarous a manner as to lose much of its dignity.” Writing again from Verona January 21, 1550, to Paolo, after telling him what he should point out to his father, he says: “You will tell him also that M. Michele di San Michele has seen my globe and that he likes it.... When I come I will make note of the principal places, for I desire very much to verify them with the report of navigators telling what they have found, concerning which matter, I think, no one knows more than you do, or especially your distinguished father. As to the celestial sphere, I should like very much to compare one I have with the one your father is having made, that I may learn how the constellations compare, and how many more of the fixed stars have been inserted. I have changed their position twenty degrees. Whether he agrees with me or not I do not know.” NOTES [198] Harrisse. Discovery, p. 247. [199] This is clearly recorded in such important maps as the Cantino, Canerio, Waldseemüller, Schōner globe maps of 1515 and 1520, Boulengier gores, Liechtenstein gores, et al. [200] Wieser, F. R. v. Die Karte des Bartolomeo Columbo über die vierte Reise des Admirals. Innsbruck, 1893. [201] See above, p. 88.