Now Ready, Ninth Edition, Revised and Enlarged, Price 18s. Demy Svo, Cloth. With Numerous Illustrations, reduced from Working Drawings. Lecturer on Marine Engineering to the Royal Naval College, Greenwich; Member of the Part III. Details of Marine Part V.-Boilers. culations for Cylinders, Part VI.-Miscellaneous. "In the three-fold capacity of enabling a Student to learn how to design, construct, and work a modern Marine Steam-Engine, Mr. Seaton's Manual has NO RIVAL as regards comprehensiveness of purpose and lucidity of treatment."-Times. "The important subject of Marine Engineering is here treated with the THOROUGHNESS that it requires. No department has escaped attention. . . Gives the results of much close study and practical work."-Engineering. "By far the BEST MANUAL in existence. Gives a complete account of the methods of solving, with the utmost possible economy, the problems before the Marine Engineer."-Athenæum. "The Student, Draughtsman, and Engineer will find this work the MOST VALUABLE HANDBOOK of Reference on the Marine Engine now in existence."-Marine Engineer, LONDON: EXETER STREET, STRAND. SECOND EDITION, Revised and Enlarged. Pocket-Size, Leather, also for Office Use, Coth, 128. BOILERS, MARINE AND LAND; THEIR CONSTRUCTION AND STRENGTH. A HANDBOOK OF RULES, FORMULE, TABLES, &C., RELATIVE TO MATERIAL, SCANTLINGS, AND PRESSURES, SAFETY VALVES, SPRINGS, FITTINGS AND MOUNTINGS, &c. For the Use of all Steam-Users. By T. W. TRAILL, M. INST. C. E., F. E. R. N., In the New Issue the subject-matter has been considerably extended; Tables have been added for Pressures up to 200 lbs. per square inch, and some of the Tables have been altered, besides which new ones and other matter have been introduced, which have been specially prepared and computed for the SECOND EDITION. "Very unlike any of the numerous treatises on Boilers which have preceded it. use ul. form. Rea ly Contains an ENORMOUS QUANTITY OF INFORMATION arranged in a very convenient Those who have to design boilers will find that they can settle the dimensions for any given pressure with almost no calculation with its aid. A MOST USEFUL VOLUME.. supplying information to be had nowhere else."-The Engineer. "As a handbook of rules, formulæ, tables, &c., relating to materials, scantlings, and pressures, this work will prove MOST USEFUL. The name of the Author is a sufficient guarantee for its accuracy. It will save engineers, inspectors, and draughtsmen a vast amount of calculation."-Nature. "Mr. Traill has done a very useful and unpretentious piece of work. Rules and tables are given in a way simple enough to be intelligible to the most unscientific engineer."-Saturday Review. "By such an authority cannot but prove a welcome addition to the literature of the subject. In the hands of the practical engineer or boilermaker, its value as a ready, reliable, and widely comprehensive book of reference, must prove almost inestimable. Will rank high as a standard work on the subject. We can strongly recommend it as being the MOST COMPLETE, eminently practical work on the subject."-Marine Engineer. "To the engineer and practical boiler maker it will prove INVALUABLE. Copious and carefully worked-out tables will save much of the calculating drudgery. Many exceedingly useful and practical hints are given with regard to the treatment of iron and steel, which are exceedingly valuable, and the outcome of a wide experience. The tables in all probability are the most exhaustive yet published. Certainly deserves a place on the shelf in the drawing office of every boiler shop.'Practical Engineer. "We give it a hearty welcome. A handy pocket book. Our readers cannot do better than purchase a copy. Cheap at five times the price. The intelligent engineer can make a safe investment that will yield him a rich and satisfactory return."-Engineers' Gazette. "From the author's well-known character for thoroughness and exactness, there is every reason to believe that the results given in the tables may be relied on... The great experience of the author in all that relates to boiler construction constitutes him an authority that no one need be ashamed of quoting, and a guide as safe as any man in Britain."-Shipping World. LONDON: EXETER STREET, STRAND. With very Numerous Illustrations, in large Crown 8vo, Handsome Cloth, 68. Also Presentation Edition, Gilt and Gilt Edges, 7s. 6d. THE THRESHOLD OF SCIENCE: A VARIETY OF EXPERIMENTS (Over 400) ILLUSTRATING SOME OF THE CHIEF PHYSICAL AND CHEMICAL PROPERTIES OF SURROUNDING OBJECTS, AND THE EFFECTS UPON THEM OF LIGHT AND HEAT. BY C. R. ALDER WRIGHT, D.Sc., F. R. S., Lecturer on Chemistry and Physics in St. Mary's Hospital Medical School, London. In this work the object aimed at is to provide a kind of 'Playbook," which, in addition to affording the means of amusement, shall also to some extent tend in the direction of the course of mental education advocated by the British Association Committee, so that whilst the young philosopher finds pastime and entertainment in constructing simple apparatus and preparing elementary experiments, he may at the same time be led to observe correctly what happens, to draw inferences and make deductions therefrom. "An ADMIRABLE COLLECTION of Physical and Chemical Experiments a large proportion of these may be performed at home without any costly apparatus." Journal of Education. "Just the kind of book to add to a school library." "-Manchester Guardian. "Clear, terse, and attractive, the volume is to be most highly recommended." -Public Opinion. "Dr. Alder Wright has accomplished a task that will win for him the hearts of all intelligent youths with scientific leanings. Step by step the learner is here gently guided through the paths of science, made easy by the perfect knowledge of the teacher, and made flowery by the most striking and curious experiments. Well adapted to become the TREASURED FRIEND of many a bright and promising lad."-Manchester Examiner. "The work is quite as instructive as it is entertaining.. language throughout is clear and simple."-School Guardian. The "From the nature of gases to the making of soap-bubbles, from the freezing of water to the principles of pin-hole' photography, Dr. Alder Wright's book is an authority."-Liverpool Mercury. LONDON: EXETER STREET, STRAND. Eighth Annual Issue. Now Ready. THE OFFICIAL YEAR-BOOK OF THE SCIENTIFIC AND LEARNED SOCIETIES OF GREAT BRITAIN AND IRELAND. PRICE 7/6. COMPILED FROM OFFICIAL SOURCES. Comprising (together with other Official Information) LISTS of the PAPERS read during 1890 before the ROYAL SOCIETIES of LONDON and EDINBURGH, the ROYAL DUBLIN SOCIETY, the BRITISH ASSOCIATION, and all the LEADING SOCIETIES throughout the Kingdom engaged in the following Departments of Research :$ 6. Economic Science and Statistics. § 1. Science Generally: ie., Societies occupying themselves with several Branches of Science, or with Science and Literature jointly. § 2. Mathematics and Physics. $3. Chemistry and Photography. $4. Geology, Geography, and Mineralogy. $5. Biology, including Microscopy and An thropology. 7. Mechanical Science and Architecture. 8. Naval and Military Science. $9. Agriculture and Horticulture. $ 10. Law, $11. Medicine. § 12. Literature. "The YEAR-BOOK OF SOCIETIES is a Record which ought to be of the greatest use for the progress of Science."-Sir Lyon Playfair, F.R.S., K.C.B., M.P., Past-President of the British Association. "It goes almost without saying that a Handbook of this subject will be in time one of the most generally useful works for the library or the desk."-The Times. "The YEAR-Book of SocietIES meets an obvious want, and promises to be a valuable work of reference."-Athenæum. "The YEAR-BOOK OF SCIENTIFIC AND LEARNED SOCIETIES meets a want, and is therefore sure of a welcome."-Westminster Review, "In the YEAR-BOOK OF SOCIETIES we have the FIRST ISSUE of what is, without doubt, a very useful work."--Spectator. The YEAR-BOOK OF SOCIETIES fills a very real want. The volume will become a Scientific Directory, chronicling the work and discoveries of the year, and enabling the worker in one branch to try his hand in all that interests him in kindred lines of research. We trust that it will meet with an encouraging reception."-Engineering. "The OFFICIAL YEAR-BOOK OF SOCIETIES, which has been prepared to meet a want long felt by scientific workers of a Representative Book, will form a yearly record of Scientific Progress, and a Handbook of Reference. It is carefully printed, and altogether well got up."-Public Opinion. Copies of the FIRST ISSUE, giving an Account of the History, Organisation, and Conditions of Membership of the various Societies [with Appendix on the Leading Scientific Societies throughout the world], and forming the groundwork of the Series, may still be had, price 7/6. Also Copies of the following Issues. The YEAR-BOOK OF SOCIETIES forms a complete INDEX TO THE SCIENTIFIC WORK of the year in the various Departments. It is used as a ready HANDBOOK in all our great SCIENTIFIC CENTRES, MUSEUMS, and LIBRARIES throughout the Kingdom, and will, without doubt, become an INDISPENSABLE BOOK OF REFERENCE to every one engaged in Scientific Work. 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