Farms are now taken on speculation, with the view, not to increased production of the land, but to further changes in the experimental policy of the nation. But in reality we apprehend that such cases are the exception, and not the rule. We have heard it trumpeted abroad that certain farms in East Lothian were let during the course of last year at an advance. We have taken pains to investigate this matter; and we find on inquiry that, in some cases, such farms have been taken by new men of little agricultural experience. Lord Kinnaird may be glad to hear this, but we cannot view it in the light of an encouraging symptom. Others, no doubt, have been retaken, probably under the influence of such considerations as we have just stated. Again, we find that some farms in the south of Scotland are very differently situated now, than they were before. The extension of the railway system has given to such of them as are near stations, advantages which were enjoyed heretofore by such farms only as were in the immediate vicinity of large towns; and in this way their value has been increased. But it is quite evident, that, unless some extraordinary fallacy lurks in the tables which we have given above--unless the leading practical agriculturists of Scotland are either possessed by some monstrous arithmetical delusion, or banded in some organised conspiracy to mislead the public mind--no exceptional case can be admitted as of any weight whatever in determining the general question. On the part of ourselves, and of our correspondents, we not only invite, but we broadly challenge investigation. We desire that the truth may be made known, because any delusion on either side must tend to the public detriment.