T.S.I., of O.—Your article is very well written, but as we have devoted already so much space to the same subject for the last two weeks, we shall be obliged to omit it. M. C. R., of O.—Ifwe understand your description of the lamp, it is a valuable improvement. You had better send us a sample, from which we shall be better able to judge of its patentability. T. H., of Pa.—We do not advise any one to order the receipt of Mr. Morse. If we had carefully read the advertisement it would never have appeared in our oolumns. We suppose your plan for increasing adhesion of locomotive wheels might work, but it appears too complex to come into use. M. B. E., of Wis.—We have entered your subscription for one year. If you wish our opinion in respect to an improved scraper, please to send us a sketch and description, as we cannot undertake to furnish all the different claims which have been granted. C.W. B., of Ohio.—If you wish us to say any thing more about your invention than what we have already, we shall require of you an operating model. S P. D., of N. S. The most popular work on the steam engine is Dr. Lardner's; price, we believe, about $4. Messrs. Appleton&Co., 200 Broadway, sell it. We do not know of any models or plates for sale. D.S., of N. J.—We believe you have a new idea, but whether it be practicable or not, is more than we can tell from your rude drawing. Send us a model and we will advise you further-guess there is no doubt but that your plan is patentable. G. C.,of N. Y.—We will admit that your pump is unlike Jeffrey's in some of the details, but we do not discover any patentable points aboutit. L. C. L., of Ky.—We do not agree with your sentiment in that respect; we think a man's title to his Letters Patent should be protected by the same laws that protect to him his farm or his cattle, and why not let it be attachable for debt by the same process? M. W. B., of Md.—The peculiarly mysterious performance which you explain as practiced among certain of your friends, must belong to the Spiritual Rapping department of science—a theory that has developed itself since we left school, therefore we are unable to enlighten your inquiring mind. C. R. S., of Vt.—A letter addressed to the Commissioner of Patents, making the inquiry you do o.. us, will be answered. J. E. C., of R. I.—Your plan for a propeller has been submitted to us for an opinion as often as three times a year, on an average, for the last seven years —not a thing about it that is new. J.A., of Me.—Thlf work is for sale by H. C. Baird, Philadelphia, as the notice stated; the price we do not know. J. B. C., of Boston—We either do not understand your invention, or else it is a. miserable contrivance . U. B. V., of Pa.—We have examined the sketch of your alleged improvement in brakes. Within the past year a patent was issued for a brake, which combined essentially the same principle as you illustrate. J. N. F., of Va.—We will attend to answering your inquiries about boilers as soon as the information can be obtained. J. B. A., of S. C.—Your specification and drawings have been forwarded to the Patent Office ; it will be of no use to send the other model. J. P. M., of Mass.—The use of speaking-pipes in any particular position, or for any specific purpose, would not be patentable. The plan your friend pro ,.poses has before been suggested to us. We addressed a letter to M.&D. on the 13th Nov., ult. "Dumfries Reformer"—We think Messrs. Hoe can furnish you with the stereotype of a steam engine of about the size you mention ; we cannot. $2 received on account of Mr. Stewart. S. S. W., of Ga.—” Reid on Watch Making “ costs $5,00 in this city, and the postage on it by mail would be about 75c. more. J. L., of Pa.—You can find no one work which em - braces all the information you require upon dyeing wool, silk, and cotton, We have seen a very small work, price $17, treating upon wool and cotton dye - ing. Gilroy's work has several good processes in it, but where errors exist it requires a practical dyer or chemist to detect and avoid them. We do not know who has the work for sale, but think Messrs. Harpers&Bros. are the publishers. J. C., of N. Y.—We can discover nothing new or patentable in your rotary engine ; we have been familiar with its principle and construction for several years. W. M., of S. C.— You will soon hear from us in re- ard to your invention. J. P., of Ark.—Your alleged improvement in rotary engines will not interfere with Mr. Barrow's. Some two years ago an engine, upon the same plan, was put into operation in this city, but it did not prove to possess such advantages as were originally claimed for it. Money received on account of Patent Office business for the week ending Saturday, Nov. 27:— T. A., of N. Y., $30; S. E. S., of Vt., $30 ; G P. of Conn., $55 ; H. G. R., of Pa., $55 ; F. F., of Mo. $65 ; W. A. R., of Tenn., $10 ! F. H., of N. J., $30; J. B. T., of N. Y., $30; W. F., of Pa., $50. Specifications and drawings belonging to parties with the following initials have been forwarded to the Patent Office during the week ending Saturday, Nov. 27 : J. E. A., of Conn.; G. W. W., of N. Y.; N. P. G., of N J., and F. R. C., of Mass.