The reader--or rather the critical economist--may treat the foregoing remarks as speculative or not, according to the colour of his opinions. All the discussion upon free-trade has been speculative, and so was the legislation also. We take credit for having anticipated what we now see realised; but beyond that, and beyond the facts which the experience of former years has given us, and which we have just laid before our readers, we are, as a matter of course, open to objection, and also liable to error. We have not been arguing, however, without sound data--such as, we suspect, never were brought fully under the eye of our statesmen--and they all tend manifestly and clearly to the same conclusion. That conclusion is, that, without the reimposition of a protective duty, prices cannot rise above the present level. Our argument goes further; for we hold it to be clear that, without some extraordinary combination of circumstances which we cannot conceive, prices must decline, and decline greatly. We look for nothing else; but having had our say as to the future, and pointed out the prospect before us, we shall now confine ourselves to present circumstances, and endeavour to ascertain whether, with a continuance of _present prices_, and under existing burdens, agriculture can be carried on in Britain at a reasonable profit to the farmer. Mr Caird's pamphlet, though it has attracted a good deal of attention, contains no hints or information which are new to the practical farmer. Its high-sounding title would lead us to suppose that he had discovered some improved system of agriculture, which might be applicable throughout the kingdom. We read the pamphlet; and we find that it contains nothing beyond the description of a very low-rented and peculiarly-situated farm, the occupant of which appears to have realised considerable profits from an extensive cultivation of the potato. It is not necessary that we should do more than allude to the general tone of the pamphlet, which seems to us rather more arrogant than the occasion demanded. Mr Caird, we doubt not, is a good practical farmer; but we should very much have preferred a distinct and detailed statement of his own experiences at Baldoon, to an incomplete and unattested account of his neighbour's doings at Auchness. A man is fairly entitled to lecture to his class when he can show that, in his own person, he is a thorough master of his subject. A farmer who has devised improvements, tested them, and found them to answer his expectations, and to repay him, has a right to take high ground, and to twit his brother tenants with their want of skill or energy. But Mr Caird is not in this position. He is occupier of a farm of considerable extent, but he does not venture to give us the results of his own experience. It is possible that he may himself pursue the system which he advocates, but he does not tell us so; he points to Mr M'Culloch as the model. This is at best but secondary