. Charles C. Mapes'. Les machines agricoles. 64 C. C. MAPES catalogue illustré. En sod-laboure la régularité de tournant devient nécessaire pour assurer la décomposition de la matière organique dans le sol, et dans une telle pratique nos commentaires comme ci-dessus ne s'appliquent pas. Sous-sol et de SNB-sol charrues. Ce qui suit, à partir de l'agriculteur, de travail de mai 1860, décrit le processus et met en oeuvre au-dessus visées à : la désintégration de plus le sol a longtemps été admis comme souhaitable pour le mode d'adoption généralisée, et certains chercheurs ont conclu qu'aucun détail n'est trop grand qui peut pratiquement être atta

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. Charles V. Mapes'. Agricultural machinery. 64 C. V. MAPES ILLUSTRATED CATALOGUE. In sod-plowing the regularity of turning becomes necessary to insure the decay of organic matter in the soil, and in such practice our remarks as above do not apply. Sub-soiling and Snb-soil Plows. The following, from The Working Farmer, of May, 1860, fully describes both the process and implements above referred to : The deeper disintegration of the soil has long been admitted as a desirable mode for general adoption, and some experimenters have concluded that no depth is too great which can be practically attained. In particular districts, however, where the surface-loam was shallow, and the sub-soil too heavily charged with clay, it was found not beneficial to reverse the position of the soil, placing the clay on top, but that the disturbance of the clay in place, without elevating it, was advantageous; thus the digging of a trench and afterward filling it up, first with the clay and then replacing the surface-soil, caused the crops to be much greater, not only imme- diately over the trench, but for a considerable distance on each side. We remem- ber an experiment of this kind made on Long Island, by William Cobbett, and shall never forget the pride with which he showed the result to his neighbor far- mers, foretelling, at the same time, that a tool would be invented for disturbing sub-soils without elevating them. The use of a sub-soil plow at all is of very recent. Fig. 101. date. The first one imported in the United States by Messrs. Euggles, Nourse «fe Mason, in the year 1840, was of a kind not unlike that represented in the engrav- ing ; it has a wing on one side only, running from the point back, elevated at the rear five inches; and we are sorry to say that many such plows are still sold, and attempted to be used. They are suited neither to sub-soiling nor even to the economical admixture of the surface with the sub-soil. The wing being only on one side, performs but half t

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