Another feature of the English manor was the division of its arable lands into three fields, with a regular rotation of crops, and with one field out of the three always fallow. Occasionally only two fields are to be found, sometimes as many as four; but by far the most usual number was three.[30] Now it is a very significant fact that the three-field system has never been at all general in North-Western Germany, or in Jutland, the regions from which the English undoubtedly came; and it is for this reason that Professor Hanssen--who has given his whole life to the study of the agrarian history of Germany, and who is certainly not biassed by any antipathy to the mark theory--declares that the English cannot have brought the three-field system with them to Britain. Two hypotheses are tenable: either that it grew up in later centuries to meet the special needs of the country; or that it was found there when the English came. That this latter hypothesis is most probable would seem to be indicated by the fact that the region in Germany where it has been most widely prevalent is precisely that which was most Romanised, _viz._, the South West.[31] We need not follow Mr. Seebohm in his ingenious attempt to show how it grew up in Southern Germany; it is sufficient for our present purpose to point out that the fact, however it may be explained, strengthens the probability that Roman influence had a good deal to do, in Britain also, with the creation of the conditions which we find in after times.