are used in India, and five thousand of the single roller-gin in Egypt. It is understood that the saw-gin is used in but a single district in India. While the saw-gin injures any variety of cotton by cutting, tearing, napping and tangling the fibres, its action upon the long and fine staple called "sea island" is ruinous, and the roller-gin alone is suitable for working it. The slow action of the single roller-gin, cleaning about one hundred and fifty pounds of lint per day, made its cultivation too expensive, but the double roller-gin will clean nine hundred pounds in ten hours, or one hundred and twenty pounds an hour of the common upland short-staple cotton. It is thought by Southern members of the United States commission that the introduction of the double roller-gin into our country would greatly increase the profitableness of the culture of cotton, and especially of the "sea island," which is at present much neglected, and in the growth of which we need fear no rivalry. Each roller is made of walrus leather, and rotates in contact with a fixed knife, dragging by its rough surface the fibres of cotton between itself and the knife. A grating holds the seed-cotton. Besides these parts there are moving knives to which are attached a grid or series of fingers. At each elevation of the moving knives, the grids attached thereto lift the cotton to the elevation of the fixed knife-edge and of the exposed surface of the rollers: on the descent of each moving knife the seeds which have become separated from the fibre are disentangled by the prongs of the moving grid passing between those of the lower or fixed grid about seven hundred and fifty times per minute, and are by this rapidity of action flirted out. It would be scarcely fair to neglect altogether the English annex in which all the agricultural implements are exhibited, nor that which contains its carriages. So much commercial intercourse, so many journals published in the respective countries, have made each pretty well acquainted with the agricultural machines and methods of the other. The principal difference is in the splendid plant for steam-ploughing exhibited by Fowler & Son and by Aveling & Porter, and in the great number and variety of the machines and apparatus for preparing food for animals--chaff-cutters, oat- and bean-bruisers and crushers, oilcake-grinders, boilers and steamers for feed and mills for rough grinding of grain.