W. B. B., of N. Y.—There is no limit in the time allowed for the re-issue of a patent, or for a patent to be granted for an invention after its conception, provided in the latter case it is not allowed to come into general public use for a period exceeding two years before application for a patent is made. Your design for laying telegraph cables is not new. L H. N., of Vt.—Morse's patent for the electro-magnetic telegraph was extended in 1854 by the Commissioner of Patents for seven years; it will not, therefore, expire till 1861. Another renewal, if procured at all, must be obtained by especial act of Congress. P. M., of Pa.—To stock the river you mention with eels, you must obtain a number of the species from the nearest river or creek where they are found. They can be caught in an eel trap, which is very simple. It consists of a barrel with a large hole in the lid, ia which is hung a tube of coarse cloth. This trap is sunk to the bottom of the river in t'e evening, and raised in the morning. The eels can easily get into the cloth tube in the barrel but not out of it. F. E., of N. Y.—Compressed air has been employed in an engine, but without obtaining those advantages which you expect. G. J. N-. of N. J.—The Patent Office Report for 1857 has not yet been issued. B. Maclterly, of Bainbridge, Ohio, wishes to correspond with, manufacturers of hemp linen fabrics—such as would be suitable to ba employed in expressing grape*. H. K., of La.—We have never known of tinned iron tubes being employed for boilers to prevent incrustations. The advantages to be derived from them would not, in our opinion, cover the extra expense. But if you ciu demonstrate by experiment their superiority, we think you may obtain a patent. O. L. C, oi' 111.—Your reply of the 8th fully indicates a clear knowledge of what we require of you. You must proceed de novo. Send model and patent fee as soon as possible, and we will vigorously push .your case. H. E., of Conn.—Before applying for a patent on your invention, we advise you to have a preliminary examination made at the Patent Office. This will cost you the small fee of $5; and it is our experience, after a trial of eighteen months, that, in a great majority of cases, this course is the safest and best. P. K. W., of Ohio.—We appreciate your suggestion in regard to the republication of back volumes of the SOL AM., but it is impracticable at this late period. Few of the original engravings are in our possession now. W. H. B., of N. Y__You can print with copperplate or any other engravings by the use of water pressure, the water being employed aa the pressing cushion. There can be no difficulty about the operation, but we do not see what benefits can be derived from it over the common method. J. H. H., of Md.—You can enamel both sides of cloth in the same manner that one side is treated, In No. 36, this volume, Sen. AM., there is a recipe for cloth enamel varnish. _JD1 J. O., of Mass.—The Smith patent lock to which you allude we never heard of before, and from your brief description of it can give you no opinion as to its merits. If you will send us one for inspection, we will try to answer your questions. LEU, of Iowa.—You can hear of such a machine as you want for cutting out match splints by addressing Wm. Gates, Jr., Frankfort, N. Y. C. A. W., of Iowa.—We are aware that bullock'8 blood, mixed with sand and lime, is employed for making hard barn floors in Wales and some other European countries. D. P. F., of Pa.—You can procure an efficient apparatus for burning green tan of Gideon Bantz of Fredrick City, Md. For particulars write to him. Money received at the Scientific American Office on account of Patent Office business, for the week ending Saturday, May 15,1858 :— D. J. W., of Ohio, $25; B. & R., of 111., $30 ; B. & McO, of Mo., $55 ; J. L., of Mass., $15; R. & C, of N. Y., $25 ; J. H. P., of N. J., $30 ; W. H. Van G., of N. J., $30; D. R T., of Ohio, $30; F. H. O., of Pa., $25 ; W. S. H., of N. J., $25 ; E. M., of N. Y., $25 ; J. B., of Conn.. $20; S. P., of Mass., $30; J. H. C, of Ohio, $10; W. M., of Iowa, $30 ; A. E. T., of Ohio, $25 ; J. P., of Maaa., $35 ; M. W., of Ohio, $5; J. H. G. of Ky., $35 ; F. C. K., of N. Y., $30; J. F., of Mass., $90; A. A. H., of Ohio, $25; J. H. H., of S. C, $30; J. A. E.,of Conn., $30; J.M. a, of Cal., $77; T. W. L-, of N. Y., $30 ; A. F., of Ohio, $35; A. D-, of Mich., $30; J. L. S., of Tenn., $35; T. W., Jr., of Conn., $25; S. L. W., ofPa.,$25; A.B.,of Pa.,$10; J. W. P., of Pa,, $25; A. D. a, of Vt., $20; J. P.. of L. I., $30; G. W. S., of Conn., $55; A. D. B., of N. Y., $55; W. H., of N. Y., $30; J. B., of N. Y., $35 ; H. O. A., of La., $25 ; S. F. I, of Ind., $30; J. H. B., of Mass., $10 ; G. E., of Pa., $30 , W. B. C, Of Pa., $12 : B. B. & Co., of R, L, $37 ; J. M/of Miss., $27; A. A., of 111., $25; J. L, of N. Y., $30. Specifications and dra wings belonging to parties with the following initials have been forwarded to the Patent Office during the week ending Saturday, May 15,1858 :— D. J. W., of Ohio; R. & C, of N. Y.; W. W. L., of Ohio ; J. L., of Mass.; W. S. H., of N. J.; E. M., of N. Y. ; F. H. O., of Pa.; W. H. Van G., of N. Y.; A. H., of Conn.; J. H. G., of Ky.; I. F. B., of Ga.; J. B., of Conn. ; J. P., of Mass.; M. W., of Ohio; A. A. H., of Ohio; J. H. H.,ofS. C.; W. A. J.,of La.; G. \V. S., of Conn.; A. D. B., of N. Y W. H., ofN. Y.; W. W. W. ,of La.; J. W. P., of Pa.; J. P., of Tenn.; J. Kx 1 ofN. Y.; R. H. N.B.,of R. L ; L. L. C, of of N. Y.; H. O. A., of La. ; W. R C, of Pa.; C. C. W., of N. J.j JA. A., of in.Literary Notices THE LIFE AND TIMES OF HUGH MILLER. By Thomas N. Brown. Rudd & Carleton, 310 Broadway, New York. The life of a man of science, a litterateur, and a theologian, cannot failalways to call forth the deepest sympathies of our nature, for in their lives there must always be that touch of nature ".that makes the whole world kin." So in tracing through its varied scenes, incidents and occupations, there is so much of interest to all mankind, that any biography of Hugh Miller will always prove aninterestingrelationby whomsoverit is told. The one, and the first that has yet appeared, that is. now before us, seems to us very detective, because it only gives a Scottish view of Hugh Miller's character, life and genius, and in it he is regarded rather as the powerful mouthpiece of a belligerent church party than as the enunciator of the majestic truths of science. As the former, he is known in his native Scotia, and as such his name will long be mentioned in hallowed tones by the denizens of her picturesque hills and lovely vallies : but to us, to the world, hia name is known as that of a true philosopher, the poet of geology, whose writings on his favorite study are one grand epic, and his truthful imagery equal the loftiest poem. With a pen unequaled since popular science has been written, he sketched the life of a bygone world, and brought up to the mind's eye as vivid as a present scene the luxuriant vegetation of the carboniferous strata; and so we conceive that a man of his gigantic mental caliber is worthy of a biography more correct in its appreciation of his scientific character. Perhaps it may be necessary that more time should, elapse before his life can be fairly written, and until that time comes we accept the present one with gratitude, rather than have none. THE YOTJN MBNS' MAGAZINE—The number for May contains articles on " Elislia Kent Kane," and (tThe Early Italian Reviewers," which are very good. We think that were the editor to-weed his original poetry, the value of the magazine would be enhanced. WESTMINSTER REVIEW—Published by Leonard Scott & Co., No. 54 Golrt street. The number of the above Review for this quarter contains eight original essays. The leader is a favorable criticism of Auguste Comte's catechism of positive religion. It ia not profound, its author seems to consider religion as a mere scale of sentiments, not a body of active principles leading and guiding men to action. There can be no question, however, of the general ability of this periodical. Tn'E ORTENTAT. HORSE CIIABMER—By C. J. Eldridge, Cincinnati. This pamphlet professes to teach the method of taming horses, but we can find nothing in it but what has been previously published in works upon the treatment of this noble animal. THE PEINTEK—Published by Henry & Huntingdon, 1 Spruce street. New York. This is a new periodical devoted to the " art preservative of all arts," and it ia exceedingly well got up and the matter admirably selected. [Advertisement. ] THE NEW AMERICAN CYCLOPEDIA.—Reasons for Buying it, and the Ways and Means of Buying it.—The New American Cyclopsedia is popular without being superficial, learned but not pedantic, comprehensive but sufficiently detailed, free from personal pique and party prejudice,fresh and yet accurate. It is a complete statement of all that is known upon every important topic within the scope of human intelligence.— Every articlein it has been specially written for its pagea by men who are world-renowned upon tlw topics of which they speak. They are required to bring the subject up to the present moment—to state just how it stands now. All the statistical information is from the latest reports; the geographical accounts keep pace with the latest explorations; historical matters include the freshest just views'; the biographical notices not only speak of the dead, but also of the living, and of the living up to within the last halfyear. And the work is cheap. Three dollars a volume: and each volume contains more—we have ? carefully computed the contents of both—more than the whole six volumes of'Bancroft1 s history, which are sold at two dollars a volume, making in all twelve dollars. Every family ought to possess a copy of the New Cyclopaedia. It is a library in itself. LeJ each man save twenty-five cents a week, and by the time the work is complete he can not only own the fifteen volumes, but also a handsome bookcase to keep them in. Save five cents a day, (a little self-denial will do it,) and yo,u save enough to buy a set of books which will give you sound information upon nil points about which you wish to inquire. School children—certainly the members of our high schools—can all have it. Save the pennies which are given to you, run errands and ** do chores" when you can, and thus earn a quarter of a dollar a week—and the task is done. Mechanics! you have not much time to read; this thenisjust the workforyou; it will help you upon all points of inquiry—and three hours overwork per week will buy it. Lawyers, physicians, clergymen ! it will give breadth and accuracy to yourinfor-mation, aud add largely to your influence and income. The NEW CYOLOP-EDIA will be completed in 15 volumes royal 8vo.; $3 per volume, in cloth; $3 60 in library leather, $4 half morocco; $4 50 half Russia extra. D. APPLETON & CO., Publishers, Noa. 346 and 348 Broadway, New York.