The non-agricultural reader must pardon us for the insertion of these details. They are necessary for our case, because, if high farming can be made an efficient substitute for protection, we are bound to adopt it, and we should owe a deep debt of gratitude to any one who could point out the way. We are fully alive to the necessity of agricultural enterprise; and, if we thought that our farmers were standing beside their mired waggon, clamorously invoking the assistance of Jupiter, when they should be clapping their own shoulders to the wheel, we would be the first to remonstrate on the heinous folly of their conduct. It is because _no amount_ of personal exertion has been spared, that we seek to enforce their claim according to the utmost of our ability; and, in doing so, we are bound to prove, that no ordinary means which have been suggested for their extrication can be of the smallest avail. Mr Caird has come forward in the character of adviser, and we have stated the opinion of practical men as to the feasibility of his scheme. We have yet more to state, for nature has already denounced his plan far more effectually than opinion. When the county Down farmer visited Auchness in July last, he found more than one-third of the whole farm under potato culture. Upon that crop depended not only the whole profits, but a great deal more. Without the potatoes, there would have been a loss, at a more favourable calculation than his, of £419, on a farm paying only £262 of rent. _Since then_, we are informed on the best authority, _that disease has attacked the potatoes_. The highly-manured moss could not preserve from decay, if it did not accelerate it, the uncertain and precarious root. Mr Caird must not quarrel with the penalty he has incurred for having totally misunderstood the nature of the question which is now agitating the public mind. Whilst all others were directing their attention to cereal produce, he kept his eyes obstinately fixed on a little patch of ground which seemed to give unusual facilities for the growth of the doubtful potato. He never attempted to show that, without potatoes, and an exorbitant growth of that vegetable, high farming could pay at Auchness, even with the important elements of very low rent, and singular liberality on the part of an enthusiastic landlord. He perilled his whole case upon the probable returns of a root which every farmer views with suspicion; and--more than that--his statistics, which he wished to be inferred were of universal application, were only applicable to a few remote and isolated spots in Scotland. The result is, that, with all these advantages, the experiment has failed; and that all the liquid manures, economy of dung, guano stimulants, and so forth, as practised at Auchness, cannot, at present prices of produce, force up so much grain, or feed so much stock, as will nearly pay for the required and inevitable expenses. We pass over all possible mistakes.