One of the greatest annoyances to which the occupants of buildings fitted with steam and water pipes are subjected, is the leakage of the valves. It is a well-known fact that the best fitted metallic valve will become leaky very quickly, if a particle of scale or dirt from the pipe is caught between the valve and its seat while under pressure; and a leak, however slight, will cut a channel that continually grows larger. Devices have been contrived for re-grinding valves when leaky. This, however, is attended with inconvenience. The accompanying engraving illustrates a valve that seems to obviate these difficulties. The shell is made in the usual way, but with somewhat greater depth of seat than others, the stem, stuffing-box, etc., being the same as those ordinarily used. The valve is attached loosely to the stem by ball and socket joint allowing slight play. The Valve proper is composed of three parts, the lower disk, A, and the upper one, B, embracing between them a vulcanized rubber disk, G, held securely by a screw forming a part of the upper disk, and a nut, as seen. Either A or B, alone or combined, form perfect valve plugs as safe as any used on ordinary valves. In addition the flexible disk renders assurance doubly sure. The steam coming in the direction of the arrow and pressing upon the disk, A, expands this elastic disk, so that the greater the pressure the closer the fit. When worn or injured this disk may be quickly removed and another substituted. These parts are all manufactured in duplicates. This is valve adapted to steam, gas, water, and other liquids. Patented March 17,1868, by Frank Douglas, Norwich, Conn., who may be addressed for the right to manufacture or for the valves. They may be obtained also of Belknap & Burnham, who manufacture them at Bridgeport, Conn. American Antiquities. At the meeting of the American Association for the Advancement of Science, recently held in the city of Chicago, many of the papers indicated considerable activity in the researches into the antiquity and character of the early races of men who inhabited America. Col. Charles Whittlesoy, in a paper on the " Geological Evidences of Man's Antiquity in the United States," maintained that four American races preceded the red man :—First, the mound-builders; second, a race in the territory now called Wisconsin-; third, a warlike race in the region south of Lakes Ontario and Erie; and, fourth, a religious people in Mexico. Pottery, arrow-heads, etc., have been found in conjunction with and beneath the mastodon and megatherium. Human remains have also been found during excavations at New Orleans at a depth of sixteen feet. Mr. Foster exhibited a copper knife found in New Orleans, which he believed was a relic of the mound-builders. A water-jug, surmounted by a human head,and a statuette of a captive,with his hands bound behind him, both from Peru,and evidently of extreme antiquity, attracted much attention. It may also be mentioned, that the recentxplorations of Mr. E. G. Squier, in Peru, and the curious photogf aphs of ancient temples, dolmens, etc., which he has brought back, have renewed some old theories as to a connection in origin between the earliest inhabitants ot America aad those of tho oriental countries.