The more intelligent of the Liberal party are now intent on a different object, but one equally descriptive of their secret sense of the failure of their grand panacea of free trade. They are full of the incalculable effects of the application of science to agriculture; expatiate largely on the analysis of soils and liquid manures, and indulge in learned disquisitions on the application of the refuse of towns and common-sewers to the improvement and fertilisation of the soil. From the _Edinburgh Review_, which treats its readers to a learned _exposé_ of Liebig's principles, to Sir R. Peel's protegé, the Dean of Westminster, who boasts of having tripled the produce of his land by liquid manure, this is the grand remedy for the evils which they now see they have introduced. It is singular, if there is any truth in these discoveries, that though man has been labouring at the soil for four thousand years, and during that time had an ample supply of these fertilising streams, they have never been brought to light till free trade made them a question of life and death to a powerful party in the state. Having had ample experience of the application of these liquid manures on the largest and most favourable scale, we are able to give a decided opinion on this subject. Liquid manures are of great service in enriching _meadow_ lands, or forcing up _coarse but luxuriant crops of vegetables, such as cabbage or cauliflower_, of which the leaves or stems, not the seeds or roots, form an article of food. But they do not _permanently_ enrich the soil: their effect is over in a few weeks. A fresh inundation of the fertilising stream is then requisite, the effects of which are speedily evaporated. On this account they are wholly inapplicable to grain crops, and of very doubtful service to potatoes or turnips. In the emphatic language of farmers, they put no _heart_ into the ground. The vegetation they force on is entirely in leaves and stems, not in seeds or roots. If they come into general use, they may increase the determination of the agricultural industry of the country to grass cultivation, and render England in modern, as Italy was in ancient times, one great sheet of pasturage; but they will never overcome the difficulties with which free trade has environed our farmers in the raising of _grain_ crops, or enable them to compete with the harvests of the Ukraine, or the basin of the Mississippi.