R. M. L., of Me.—Chloroform was discovered by Dr. Simpson, of Edinburgh, but its application for surgical purposes is claimed by two individuals—Dr. Jackson and Dr. Morton, both Americans; Dr. Jack son was awarded a gold medal by the Paris Academy of Sciences, and received the honor of being entitled the firstdiscoverer, but his claim is disputed by Dr. Morton. I, E. C, of Md.—We should think your improvement novel and worthy of a patent, although it is difficult to decide without a sketch and description. J. S. is not the person you mention. You had better send us a model. C. W. M., of Vt.—The use of glass tubes to indicate the height of steam and water in boilers, is well known, and could not be patented. J. N., of Wis.—You are correct about the force of the water that would pass through the tube; but as action and re-action are equal, you would get the full benefit of it by allowing it to act upon the water at the stern of the vessel, upon the principle of a re-action wheel. This would save all your machinery, which will no doubt operate, but no benefit can be derived even from this, as the water running through the tube will resist the progress of the vessel just in proportion to the power that can be derived from it. L. D., of Conn.—You wish for information that would require a whole copy of our paper to give. Quartz is the basis of all glass, and you would have to learn the crystal manufacture before you could master your business. Quartz can easily be melted with, the blow-pipe. J. D., of Ohio—The only way, to our knowledge, of bringing back brittle gold, is to heat it over again, and cool it in the atmosphere. S. W. H., of R, I.—The matches which we have seen, made without sulphur, were of candle-box wood, dipped in phosphorus and the chlorate of potash. J, N., Jr., of Md.—The mechanical construction of yourpumpis different from any we have seen, but the principle is essentially like Read's and others— well known. M. M. M., of Vt.—We suppose a tubular boiler would be best for your use. Messrs. Stillman, Allen & Co., Novelty Iron Works, this city, can furnish you. The cylinder of the engine might be 30-inch stroke and 12-inch bore. Builders can tell you better than we can. T. W., of Ala.—Your quantity of water per minute is very small; it is scarcely one horse actual power ; 210 gals, per minute, and 24 feet fall, is of the following horse-power, 210 multiplied by 10, multiplied by 24, divided by 33,000 is equal to T52, a little over one-half nominal horse-power- A gallon of water is 10 lbs ; 33,000 lbs. lifted one foot high, per minute, is a horse-power; about 30 per cent, is deducted from the nominal horse-power for friction, &c. If the 210 gallons fell per second, you would have sixty times the power. M. L., of Boston—We could not find out your inventions at the Fair. If Mr. W. had called or shown us the model, it would be more proper than for ua to go in search of it; although we often do such things it is not right to ask us; we have too many calls to attend to them all without serious loss of time ; we are, however, always willing to notice all new and useful inventions. E. B., of N. Y.—The prizes mentioned by you were offered by F. M. Ray, of this city. You are too late, as the committee have already passed their examination, O. L., of Pa.—The idea you suggest in regard to cigars is new to us, but we doubt whether a patent could be secured for it. The principle is similar to the celebrated Meerschaum pipes, which are said to relieve tobacco of everything unpleasant, they are made of a kind of clay which consists of a hydrate of magnesia combined with silex. W. F., of Tenn.—If you will again consider the subject of paddle wheels, you will see that your plan will not work well. We see nothing new in it. J. C, of Geo.—We shall write you by mail in re gard to the machine for cross grooving. Dr. B. H. W., of Ky,—It will be impossible for us to advise you respecting the stave dressing machine simply upon a written statement. This class of inventions has received much attention, and it is difficult to produce any decidednovelty. From what we could judge by examination of t e rough model you sent us some time since, we thought the contrivance new but by far too complex. The reduction of its parts may strip it of its novelty. We can scarcely judge without a clearly described drawing or model. J. Y,, of Ohio.—The model of your improvement Came duty to hand, and the business will receive early attention. The specification will soon be sent to you tor signature and oath. B. B , of Md.—The noticing of a claim does not secure the invention ; those which we notice have all paid their fees for the patents. "We have never seen a machine exactly likeypars, but we have seen a concave and convex with spikes working into one another for grinding corn. You will see an engraving of this mill on page 49, Vol. 4, Scientific American. G. W. S., of Boston.—A tunnel to relieve Broadway was proposed Borne years ago. Mr. Osfoorn, of Albany, N. Y., has brought the plan before the public again, at the present Fair of the American Insti-tutue. It will not do until our sewers are differently built—the tunnel would be flooded at high tides, for our streets are not much higher than high water. V J. E. C.j ofMd.—Yourwagon arrangement is new to us, and we believe it is patentable; but it will make the wagon more expensive, and carmen have Bvinced some partiality for the one which swings on an axis. H. B., of Wis.—We are much obliged to you for pour kindness. You have misinterpreted us ia respect to the centrifugal force (according to Newton) increasing with the velocity. ( We only have asserted that there is no such a thing as an independent force sailed centrifugal. Be cautious about publishing vour ideas on force. You know the moon describes i helical patch in its annual processions. O. H. S.. of La.—The Plow, Loom, and Anvil is published at No. 9 Spruce street, this city, and the Franklin Journal is published by the Society of the Franklin Institute, in Philadelphia. S. R., of Md.—We will attend to your business immediately. We do notexactly understand from your Letter whether Mr. O. has received the note we sent him or not, W. B., of Ala.—We do not like the idea of paying postage on your letter for the privilege of giving information in no way interesting to us. We have jeveral times been so treated, we hope unintention-illy. A. B., ofVt—Your article partakes of a party character, consequently it cannot find place in our columns. B. W. W., of Tenn.—We will endeavor to gain you the desired information. K. S. K, of N. Y.—We hope you will not put your Machine in operation until you have faithfully jounted the cost. We haye given you the best ad-rise we could. W. K., of Conn.—You ask, " what is'a horse pow-3i 1" we had thought that no one, a reader of the 3ci. Am., wpuld have been under the necessity of iskingit. It is 33,000 lbs. lifted one foot high in one minute. Money received on account of Patent Office business for the week ending Saturday Oct. 23 :—. A. A. D., of Ga, $40; T. S., of 111., $50: R. 0. B., Df 111., $200; J. Y., of O., $65; B. J. D., ofMd., $2.0; W. G. H., of Pa , $47; S. W. of 111., $20 ; A. H. O.. ofN. Y., $25; J. H., of Mass., $35; S. B. H., ofN. Y., fclO; B.L.G., of N. J., $25. Specifications and drawings belonging to parties with the following initials have been forwarded to the Patent Office during the week ending Saturday, Oct. 23: H. F. P, of N. Y.; r. I. P., of N. Y.; F. T., of N. Y.; S. W, of 111.; A. H. C., ofN. Y, E. L. G., of N. J