Frobisher sailed on his first voyage in June, 1576. The tract of Sir Humphrey Gilbert, entitled, _A Discourse of Discovery for a new Passage to Cataia_, principally written ten years before, was published before Frobisher left the Thames. The reference in this tract to Sebastian Cabot—who “by his personal experience and travel hath set forth and described this passage [that is, the Straits of Anian] in his charts, which are yet to be seen in the Queen’s Majesty’s Privy Gallery at Whitehall, who was sent to make this discovery by King Henry VII., and entered the same fret,” etc.—has led Mr. Biddle to suppose that Frobisher had the benefit of Cabot’s experience, and that his maps or charts hanging in the gallery at Whitehall had delineated on them the strait or passage through to the Pacific, which Cabot entered, and would have passed on to Cathay, if he had not been prevented by the mutiny of the master and mariners.[61] One would naturally infer that Gilbert wrote this passage after inspecting the map in Whitehall, but the full passage of which we have here given an extract is taken from Cabot’s letter in Ramusio,[62] to which work Gilbert refers in the margin of his tract thus: “Written in the Discourses of Navigation.”[63] I may add that in the following year, 1577, Richard Willes published a new edition of Eden,[64] containing all the references to Cabot in the genuine edition, and also a paper on Frobisher’s first voyage, with some speculations, added to those of Gilbert, as to the northwest passage. In this paper, addressed to the Countess of Warwick, he makes frequent reference to Cabot’s card or table, in possession of the countess’s father “at Cheynies,” as proving by Cabot’s experience the existence of such a strait as had been spoken of by Gilbert, and of which Frobisher in his first voyage was in search. He says: “Cabota was not only a skilful seaman but a long traveller, and such a one as entered personally that strait, sent by King Henry VII. to make this aforesaid discovery, as in his own discourse of navigation you may read in his card drawn with his own hand; the mouth of the northwest strait lieth near the 318 meridian, betwixt 61 and 64 degrees in elevation, continuing the same breadth about 10 degrees west, where it openeth southerly more and more.”[65]