B. &F., of Me.—A patent was granted in England, in 1824, to W. If. James, for precisely the improvement you describe, viz., placing the drivers on separated axles, each having two cranks at right angles to each other, driven by separate pistons and cylinders. This device was applied to a locomotive for common roads, and this would be a sufficient ground for the refusal of a patent, for the application of the same thing to a railway locomotive, even if it has never been proposed to apply it on railways, which we think doubtful. Some locomotives patented by R- Stephenson, (the great English engineer,) having three cylinders connecting with three cranlts oil one driving shaft, were tried in England about ten or twelve years ago. The object to be accomplished by this was partly the same aa that which you desire to obtain ; but the invention was -never extensively used. W. H., of 111—It is possible to dcompose ateam by passing it through red-Lot iron tubes. This is not, however, effected entirely by the agency of heat, as heat alone can never effect the decomposition ; but the oxygen oi the ateam is caused to combine with the iron and thus the hydrogen is act free. To effect the decomposition of steam by heat, the pipes must be made of Borne material having a great affinity for oxygen, which affinity will be increased by heat ; or they must contain gome material—which must be renewed from time to time—possessing tlie above characteristics. Many experiments of the kind you describe have been tried, both with a view to the use of tho gases as a motive agent, and as fuel, but with not much success. A patent was recently granted for an apparatus for decomposing the exhaust steam from an engine in the furnace, and burning up the gasea We cannot say that youi idea of decomps; ing the steam in the, tubes, and keeping the tubes heated liy their combustion, has been full anticipated, but we do not regard it as having the slightest approach to practicability. E. C. M., of-----.—Your theory regarding theapot on the sun being huge chunks of planets, broken by col luions, and precipitated on the disk of the great lumi-minaryof day, 3 certainly new, but we fail to gain from it any more light on these spots. Your opinion that the moon once occupied the position now filled by the Pacific Ocean, and that it was projected from the earth toits present position by a terrific explosion, is alsc new, and as droll as it is novel. The explosion musi have been one of no small magnitude, und Mthe: Earth must have kicked btTClt considerably after discharging such a respectable sized bullet a distance o 237,000 miles. Talk of the monster cannon of moden days, and Lancaster gun?, after such an exploit o ancient gunnery—it's all moonshine. J. N. T., of 111.—In tuiswer to your inquiries reaped ing the "Paine light," you are perfectly correct h your views regarding the general construction of tin apparatus by which Paine averted he could deeinnposi water and resolve it into a single ga3, capable ot givinj a brilliant light, but the whole affair was a complete failure. The apparatus could not decompose water, no: could he obtain a good white light from the gas of thi .Kater, even if he had decomposed it in the manner In described. Water had been dt\c;omposed long before h professed to have made the discovery, by currents o electricity, generated by revolving helices in.the ja,g netp-electric machine ; but no useful application can bi made of this scientific fact, owing to the great coat a1 which the hydrogen of the water is thus obtained, anc because it has to be carbonized with camphene or naph tha after it is generated, aa without carbonization i produces only a dull blue flame. W. F. W., of Philadelphia.—"We are not aequaintec with a cement for mending glass that will remain iluii when cold, and be clear and resist the action of hea and moisture when dry. Thecommon diamond cemen for glass and china is composed of iainglass soaked ii water until it becomes soft, then dissolved in proo spirit, to which a little mastic dissolved in alcohol ii added. G. H, A., of Wis.—You will find a description of tin process for manufacturing glue on page 259, Vol. 11 SOIETIFIC AdEUICA. S. M., of Del.—We do not know of any one whi would take an interest in your invention abroad. You best course would be to get some one with whom yoi are acquainted to aid you. J. A., oi Ohio.—Your cornstalk cutter could not bi made profitable under foreign patents. Indian corn ii not much cultivated in European countries. There i scarcely a stalk of it grown in England or France. & C, ofN. Y.—We are really at a loss to know wha you mean by stating that you are prepared to defend tin theory in the article published, viz., ** which are thi best—plain or ornamental stoves?" You surely do no mean that iron below a Ted heat will decompose air That is the only point in question. A. W., of Me.—We do not see what advantage is to bi obtained by the use of a tube 300 or 400 feet long, t conduct the Atlantic cable from the stern of the vessel A tuba that will conduct it into the water, in our opin ion, k sufficiently long. M. C. M., of D. C—Your communication has beei received, and will meet with attention. J. A M., of N. Y.—The office of the Scottish Amen cauJmtrnalla No. Ill Nassau st., this city. It is, ai you truly remark, an excellent newspaper. C. F. A., of Mass.—Stick molasses candy ia made b; drawing it, while pretty hot, between the hands, unti it is quite cool. The drawing, doubling, and twisting o it changes its color, from black to yellow, and renders i more tough. Flour is sometimes intermixed with thi mass, but it adds nothing to its quality. J. C., of Ohio.—To enable us to get up an engraving of your corn planter we shall require ft model. Tin i expense will be $12. We do not print circulars. W. H., of N. Y.—You can procure a pamii! :t c taining the copyright law of Baker, Godwin & Co., of this city. J. M. W., of Oxford.—We do not think there ia any chance for a patent on your proposed method of adjusting maps by means of cords and pulleys. Substantially the same thing has been vwedfor this purpose. Money received at the Scientific American Office on account of Patent Office business, for the week ending Saturday, December 20, 1857 :— M. C.,of Mass., $25; W. H. A.,of Ga,, $23; S. L., of L. I., $30 ; J. & S. P. P., of N. J., $30; II. & S., of 111., $30 ; E. H. K., of N. Y, $30 ; L. B. S., of Conn., $30 ; F. N., of L. I., $50 ; W. & S., of Mass , $31! ; W. D., of Pa., $25; G. L. D., of Pa., $25: H. D. B., of N. Y., $30; F. L. W., of S. O, $25; W. R. L., of Conn., $25 ; W. G.,ofN. Y, $30; L. S. C, of N. Y., $30; F. C. G, of N. J., $10 ; L. C. W., of N. C, $25 ; L. L. N., of Mich., $25 : L. E., of Mich., $75 ; L. R., of Mass., $15 ; B. M., of N. Y., $15; J. McA , of N. Y, $40 ; It R., oi'N. Y $25. Specifications and drawings belonging to parties with thefollowing initials have been forwarded to the Patent Office during the week ending Saturday, December 26,1857 :— B. M., of N. Y. ; 11 R,, of N. Y. ; G. L. D., of Pa. ; W. D., of Pa. ; W. H. A., of Ga. ; M. C, of Mass. ; J. II. F., of Cal. ; W. R, L., of Conn. ; F. L. W., of S. C; L. C. W., of N. C. ; J. McA., of N. Y ; L. L. N., of Mich.