In sailing from Reykjanes to any part of Ireland one could not arrive before the fifth day of twenty-four hours was well advanced, and it would be easy to find a point which would occupy exactly the time prescribed. From Langanes to Jan Mayen the distance is correct within eight miles, which may easily be accounted for by slight differences in the points of arrival or departure. From Mevenklint to Greenland would occupy 1·16 days of twenty-four hours. Thus the discrepancies are so slight that even if the rate had to be limited to this average, the statements would be as correct as so vague a unit as a day’s journey would permit, and of course the variation in speed must have been greatly in excess of anything required absolutely to justify these estimates in the smallest detail. That in the case of three out of five statements such a correspondence should be fortuitous seems to me to be out of the question. It will doubtless be objected that I am not justified in interpreting the same word in the same passage by two different periods of time. The compilers of the Landnámabók, however, expressly disclaim personal responsibility for the statistics recorded. They are based on the reports of ‘vitrir menn’, men that is with the requisite special knowledge, and once it is admitted that the meaning of the expression ‘dægr’ may have varied from place to place, there is nothing extraordinary in a discrepancy of this nature being exemplified in a passage based on information gathered from different informants in the east and west of Iceland.