The claim was made near a century later by Livio Sanuto in his _Geographia_, published at Venice, in 1588, that Sebastian Cabot had been the first to observe this variation, and had explained it to Edward VI., and that he had on a chart placed the line of no variation at a point one hundred and ten miles west of the island of Flores in the Azores. These observations of Columbus and Cabot were not wholly accepted during the sixteenth century. Robert Hues, in 1592, a hundred years later, tells us that Medina, the Spanish grand pilot, was not disinclined to believe that mariners saw more in it than really existed and that they found it a convenient way to excuse their own blunders. Nonius was credited with saying that it simply meant that worn-out magnets were used, which had lost their power to point correctly to the pole. Others had contended that it was through insufficient application of the loadstone to the iron that it was so devious in its work. What was thought possible by the early navigators possessed the minds of all seamen in varying experiments for two centuries and a half. Though not reaching such satisfactory results as were hoped for, the expectation did not prove so chimerical as was sometimes imagined when it was discovered that the lines of variation were neither parallel, nor straight, nor constant. The line of no variation which Columbus found near the Azores had moved westward with erratic inclinations, until to-day it is not far from a straight line from Carolina to Guinea. Science, beginning with its crude efforts at the hands of Alonzo de Santa Cruz, in 1530, has so mapped the surface of the globe with observations of its multifarious freaks of variation, and the changes are so slow, that a magnetic chart is not a bad guide to-day for ascertaining the longitude in any latitude for a few years neighbouring to the date of its records. So science has come around in some measure to the dreams of Columbus and Cabot. But this was not the only development which came from this ominous day in the mid-Atlantic in that September of 1492. The fancy of Columbus was easily excited, and notions of a change of climate, and even aberration of the stars were easily imagined by him amid the strange phenomena of that untracked waste. While Columbus was suspecting that the north star was somewhat wilfully shifting from the magnetic pole, now to a distance of 5 deg. and then of 10 deg., the calculations of modern astronomers have gauged the polar distance existing in 1492 at 3 deg. 28', as against the 1 deg. 20' of to-day. The confusion of Columbus was very like his confounding an old world with a new, inasmuch as he supposed it was the pole star and not the needle which was shifting.