There is a great amount of competition this year, in reaping and harvesting, power machines. We have seen, in all our excellent agricultural cote xporaries, and have heard from many eyewitnesses, accounts of various trials, to test the qualities of different machines. Last year we presented detailed statements of a number of such trials, but such experiments have been so numerous this year, and have been spread over such a vast extent of our country, that we cannot do BO without taking up too much space in our columns. These trials are interesting to us; they afford us useful matter for reflection and instruction. Mowing and reaping machines have been known in this country since 1833, and yet very few ol our people—even those most in terested personally in such machines—cared veiy much for them, or gave them the least attention until within the past four or five years. The public also appears to have been supremely callous respecting either their use or necessity, until their utility and benefits were fully displayed in the presence of Royalty, in a country 3000 miles distant from the native place of the two original American inventors—McCormick and Hussey. Thus once again was the truth of that saying confirmed —1; a prophet hath no honor in his own country." Even in Britain it has been discovered that a reaping machine was invented many years ago, and its inventor (Patrick Bell) also was no exception to the above saying. Our agriculturists seem determined to make amends for past neglect in relation to power reapers; we judge so because of the numerous trials to which we have alluded, and not only from such experiments, but also from the many modifications of such machines which have recently been brought before the public. In the Crystal Palace no less than ten reaping and mowing machines art on exhibition. There is McCormiek's, patented in 1834, improvement patented in 1847, and re-issued in 1853. [N-oleor, than tUOO e{ Htnae moohino. have been sold in the West ] Obed Hussey's patented, in 1834, and with which its invent tor is now in England, astonishing the people there by exhibiting one of his latest improvements ; Ketchum's, ot Buffalo, patented in 1847; Many's, ot Freeport, 111., patented in 1851 ; Adkins', of Illinois, patented in 1851; Seymour & Moigan's, Brockport, N. Y, patented in 1852 ; Forbush's. of Buffalo, N. Y., patented in 1852; Longett & Griffing's, 25 Cliff streets N. Y., and Burrall's, of Geneva, N. Y., patented in 1853, and C. Denton's, illustrated two weeks ago in the "Scientific American." All these machines are on exhibition in the gallery of the American Department ; there is not much difference between some of them, and in our opinion, there is still room for improvement. The motion given to the cutter is reciprocating in all of them, and this is derived from the rotary motion of the wheel as the machine is drawn forward. The motion of the cutters and va. rious movements ot all the machinery are given by gearing connected with the rolling wheel, some of which is exceedingly clumsy. The reels and parts of these machines look as if they were intended to be driven by fifty horse-power steam engines, instead of a team of horses. Every good harvester should rake and lay down the grain in proper bunches for binding, at least lay it down in proper rows. We understand that some patent rights for reaping machines have been sold within the past month, for very large sums, one whole patent, we have been told, was sold for no less than $120,000. This may be true, but we cannot help paying a just tribute to the original inventors of these machines—McCormick and HusBey. They took out the first patents, and it was their machines—McCormiek's at least—which first gained so much honor for our country at the World's Fair in London, and which has been the means of so deeply interesting our farmers at home.— Great good must result from the competing experiments of such rtachines, and we have no doubt but some of our Eastern mechanics . may strike a new vein by a comparison ot the merits and defects of those on exhibition at the Crystal Palace; we would direct their attention to this subject. To our Southern and Western mechanics is due all the honorable credit, so far, which belong to the inventors and improvers of Reaping and Mowing Machines.