TO REMOVE RUST.A lady writing from Vermont to tlie Hearth and Home says tbat she arcidtally-dieoTTITI-TO easy way of removing rast from steel. She put a number of badly-rusted forks in a tumbler of kerosene oil, and after leaving them there some time, found that the rust had become so much loosened that it rubbed ofl* readily. She says that she has since then used the oil to clean her knives and sewing machine. We suppose that many of our readers have already learned of the beneficial eiects of oil on steel, but we give the correspondent's experience for the benefit of those who have never used It for such a purpose. WONDERS OP SCIENCE.Wonders of science never cease ! Some years ago the opinion was expressed by a distinguished astronomer of Cambridge, England, that if the earth's atmosphere were but increased thirteen thousand yards in hight, so as to have an increased power of retaining the warmth poured upon it from outer space, we might do without the sun altogether, so far as our heat supply is concerned. More recently, by means of an instrument called the galvanometer, used in connection with a refractinor telescope, it has not only been proved that the stars actually give heat to the earth, but the comparative amount of heat received from different stars has been, as it were measured. DECAY OP IRON EAILINGS.Every one must have noticed the destructive combination of lead and iron, from railings being fixed in stone with the former metal. The reason for this is, that the oxygen of the atmosphere keeps up a galvanic action between the two metals. This waste may be prevented by substituting zinc for lead, in which case the galvanic influence would be inverted ; the whole of its action would fall on the zinc ; the one remaining uninjured, the other nearly so. Paint formed of the oxide of zinc, for the same reason preserves iron exposed to the atmosphere infinitely better than the ordinary paint composed of the oxide of lead. A CORRESPONDENT from Plymouth,Mass.,kindly refers us to an article supposed to be the one alluded to by several correspondents lately, deprecating the use of night soiL It is on page 103, Volume IIL of the New Series of SCIENTIFIC AMERICAN. Referring to the article, we find it to be a short extract from an exchange on the use of artificial manure called pou drette, made from night soil, and was so credited. It was cop ied by some other journal and improperly credited to the SCIENTIFIC AMERICAN. Having got started in that way, it has gone the rounds. A BLIND man in Chicago has invented a tin lunch box, with a receptacle for cold cofi'ee inside of it, and the whole thing is only 4 inches wide and 9 inches long. The box is so constructed that when empty it can be conveniently folded together, like a thin book, and carried in the pocket, M. JANSSEN, in a letter dated from Darjeeling, Sikim, British India, 23d May last, says that the spectra of some stars, which are rather ruddy colored when not disclosing the presence of hydrogerr, do positively disclose the presence of aqueous vapors THE month so far has brought us a series of accidents and casualties, by land and sea, which will make it memorable. The damage done by the recent gale in New England, and the Avondale disaster, are the two most remarkable occurrences of this kind, but the number of minor accidents has also been very numerous. THE Am&Hcan Hordogical Journal says that rings with settings likely to be damaged by heat may be soldered without injury if the part liable to injury be buried in a piece of raw potato. SALE OP MACHINERY.We call the attention of our readers to the Auction Sale of machinery of the Spencer Repeating Kifie Co., advertised in another column. It is to be sold in goston on the 28th of September. THE loss of weight experienced by a rower through perspiration in a prolonged contest like that of the Harvards with the Oxfords is from four to eight pounds. THE metal sodium is stated not to take fire on cold water, bat this is incorrect. A small piece of the metal will not do so, but a piece the size of a nut will frequently ignite.