Scanty as it is, this single item of strictly contemporary testimony is very important, because quite incidentally it gives to the later accounts such confirmation as to show that they rest upon a solid basis of continuous tradition and not upon mere unintelligent hearsay.[253] The unvarying character of the tradition, in its essential details, indicates that it must have been committed to writing at a very early period, probably not later than the time of Ari's uncle Thorkell, who was contemporary with Adam of Bremen. If, however, we read the whole passage in which Adam's mention of Vinland occurs, it is clear from the context that his own information was not derived from an inspection of Icelandic documents. He got it, as he tells us, by talking with King Swend; and all that he got, or all that he thought worth telling, was this curious fact about vines and self-sown corn growing so near to Greenland; for Adam quite misconceived the situation of Vinland, and imagined it far up in the frozen North. After his mention of Vinland, the continental character of which he evidently did not suspect, he goes on immediately to say, "After this island nothing inhabitable is to be found in that ocean, all being covered with unendurable ice and boundless darkness." That most accomplished king, Harold Hardrada, says Adam, tried not long since to ascertain how far the northern ocean extended, and plunged along through this darkness until he actually reached the end of the world, and came near tumbling off![254] Thus the worthy Adam, while telling the truth about fox-grapes and maize as well as he knew how, spoiled the effect of his story by putting Vinland in the Arctic regions. The juxtaposition of icebergs and vines was a little too close even for the mediaeval mind so hospitable to strange yarns. Adam's readers generally disbelieved the "trustworthy reports of the Danes," and when they thought of Vinland at all, doubtless thought of it as somewhere near the North Pole.[255] We shall do well to bear this in mind when we come to consider the possibility of Columbus having obtained from Adam of Bremen any hint in the least likely to be of use in his own enterprise.[256] [Footnote 253: It is further interesting as the only undoubted reference to Vinland in a mediaeval book written beyond the limits of the Scandinavian world. There is also, however, a passage in Ordericus Vitalis (_Historia Ecclesiastica_, iv. 29), in which _Finland_ and the Orkneys, along with Greenland and Iceland, are loosely described as forming part of the dominions of the kings of Norway. This Finland does not appear to refer to the country of the Finns, east of the Baltic, and it has been supposed that it may have been meant for Vinland. The book of Ordericus was written about 1140.]