The following inventions have been patented this week, as will be found by referring to our List of Claims on another page :— STKAINING SAWS.—In this invention the saw is connected by a pitman at the top and bottom to crank pulleys, so that the strain is equal at all parts of the stroke. Saws arranged in this manner may be put up at a moderate cost, and their parts are not liable to become deranged by wear ; very little friction is produced by the operation, and the principle is equally applicable to large or small saws. It is the invention of G. P. Ketcham, Jr., of Bloomington, Ind. KOLLER COTTON GIN.—This invention consists in the employment of two rollers grooved circumferentially and fitted together in the same plane, so that the projecting flanches of each roller will work in the grooves of its fellow or adjoining roller, whereby many advantages are obtained. It is the invention of Lewis J. Chichester, of New York, who has assigned it to H. G. Evans, S. Barstow, and D. L. Winteringham, of the same place. FLOUR BOLT.—S. G. McMurtry, of Memphis, Tenn., has invented an improved flour bolt, which has for its object the keeping of the meal at a proper temperature while being bolted, in order that it may be rapidly and perfectly bolted, and the bolt prevented from becoming clogged. This is effected by the employment of a fan in connection with spouts and a bolt, so that the fan blows the flour through the bolt, and the different qualities catch on ledges and pass out through the spouts. GRINDING MILLS.—Thomas E. Little, of Janesville, Wis., has invented an improvement in grinding mills, the object of which is to keep an unobstructed space all around the inner or upper stone, between it and the curb, so that the meal will be allowed to escape freely from between the stones, and the process of grinding will be expedited and the meal be kept in a much cooler state than in the ordinary mills. The invention consists in having a series of scrapers attached to a rotating head placed on the curb, the scrapers being fitted in the space between the curb and runner, and as they pass around within the space, clearing or scraping the ground meal, as it escapes between the stones into the discharge pipe. This is a most useful and practical invention, and is a valuable addition to all kinds of millstones. The following inventions were patented last week, but were omitted for want of space :— PLANING AW AT ICE IN RIVERS.—This invention provides an auxiliary attachment to steamboats, &c, which will enable them not only to remove the ice out of their track, but also pulverize or reduce it to such a state that it will rapidly dissolve into water, and thus not be capable of falling back into their path or track, and of blocking up the same before they have a chance to make their return trips. We regard this as a good contrivance and worthy of attention. It is the invention of R. W. Heywood, of Baltimore, Md., and was patented Jan. 26, 1858. COTTON PRESS.—This invention renders the jack-screw press capable of pressing upwards, and thus affords greater convenience, as the pressing-box can be situated in the picking or ginning room, and the time and labor of transporting the cotton down to the bottom of the press are saved. It also simplifies the press so that negroes can superintend its management, renders the follower self-lowering, and lessens the weight of the rack bar, which carries the follower, without impairing its strength at the point where the greatest strain comes upon it. The press, as a whole, presents the perfection of simplicity and utility. It is the invention of Judge J. W. Bocage, of Pine Bluff, Arkansas, and was patented Feb. 2, 1858. METAL TIPS TO BOOTS AND SHOES.—The saving in shoe leather which the small metallic tip on the toe of a boot or shoe effects is very great, and the invention is one of practical utility. Children are remarkably fond of kicking out the toes of their little shoes, thus rendering them useless and making it necessary that another pair should be procured, although no other part of the former pair is injured. By the use of these tips, which may be made of silver, copper, iron or any other malleable metal, the boot or shoe may be worn until it is really "done up," and they are so secured that so long as any portion of the sole remains, the tip will be held fast. They do not increase the weight of the shoe above half an ounce or an ounce. It is the invention of G. A. Mitchell, of Turner, Me., and was patented on the 5th of January last. Economically speaking, there is no doubt of its value,.as one pair of boots or shoes—men's, . ladies' or children's—can be made to last ( nearly twice the time they would without the tips.