_Spons’ Architects’ and Builders’ Pocket-Book of Prices and Memoranda._ Edited by W. YOUNG, Architect. Royal 32mo, roan, 4_s._ 6_d._; or cloth, red edges, 3_s._ 6_d._ _Published annually._ Eleventh edition. _Now ready._ _Long-Span Railway Bridges_, comprising Investigations of the Comparative Theoretical and Practical Advantages of the various adopted or proposed Type Systems of Construction, with numerous Formulæ and Tables giving the weight of Iron or Steel required in Bridges from 300 feet to the limiting Spans; to which are added similar Investigations and Tables relating to Short-span Railway Bridges. Second and revised edition. By B. BAKER, Assoc. Inst. C.E. _Plates_, crown 8vo, cloth, 5_s._ _Elementary Theory and Calculation of Iron Bridges and Roofs._ By AUGUST RITTER, Ph.D., Professor at the Polytechnic School at Aix-la-Chapelle. Translated from the third German edition, by H. R. SANKEY, Capt. R.E. With 500 _illustrations_, 8vo, cloth, 15_s._ _The Builders Clerk_: a Guide to the Management of a Builder’s Business. By THOMAS BALES. Fcap. 8vo, cloth, 1_s._ 6_d._ _The Elementary Principles of Carpentry._ By THOMAS TREDGOLD. Revised from the original edition, and partly re-written, by JOHN THOMAS HURST. Contained in 517 pages of letter-press, and _illustrated with 48 plates and 150 wood engravings_. Third edition, crown 8vo, cloth, 18_s._ Section I. On the Equality and Distribution of Forces—Section II. Resistance of Timber—Section III. Construction of Floors—Section IV. Construction of Roofs—Section V. Construction of Domes and Cupolas—Section VI. Construction of Partitions—Section VII. Scaffolds, Staging, and Gantries—Section VIII. Construction of Centres for Bridges—Section IX. Coffer-dams, Shoring, and Strutting—Section X. Wooden Bridges and Viaducts—Section XI. Joints, Straps, and other Fastenings—Section XII. Timber. _Our Factories, Workshops, and Warehouses_: their Sanitary and Fire-Resisting Arrangements. By B. H. THWAITE, Assoc. Mem. Inst. C.E. _With 183 wood engravings_, crown 8vo, cloth, 9_s._ _Gold_: Its Occurrence and Extraction, embracing the Geographical and Geological Distribution and the Mineralogical Characters of Gold-bearing rocks; the peculiar features and modes of working Shallow Placers, Rivers, and Deep Leads; Hydraulicing; the Reduction and Separation of Auriferous Quartz; the treatment of complex Auriferous ores containing other metals; a Bibliography of the subject and a Glossary of Technical and Foreign Terms. By ALFRED G. LOCK, F.R.G.S. _With numerous illustrations and maps_, 1250 pp., super-royal 8vo, cloth, 2_l._ 12_s._ 6_d._ _A Practical Treatise on Coal Mining._ By GEORGE G. ANDRÉ, F.G.S., Assoc. Inst. C.E., Member of the Society of Engineers. _With 82 lithographic plates._ 2 vols., royal 4to, cloth, 3_l._ 12_s._