The Steam Engine considered as a Heat Engine: a Treatise on the Theory of the Steam Engine, illustrated by Diagrams, Tables, and Examples from Practice. By JAS. H. COTTERILL, M.A., F.R.S., Professor of Applied Mechanics in the Royal Naval College. 8vo, cloth, 12s. 6d. The Practice of Hand Turning in Wood, Ivory, Shell, etc., with Instructions for Turning such Work in Metal as may be required in the Practice of Turning in Wood, Ivory, etc.; also an Appendix on Ornamental Turning. (A book for beginners). By FRANCIS CAMPIN, Second edition, with wood engravings, crown 8vo, cloth, 65. CONTENTS: On Lathes-Turning Tools-Turning Wood-Drilling-Screw Cutting-Miscellaneous Apparatus and Processes-Turning Particular Forms-Staining-Polishing-Spinning Metals -Materials-Ornamental Turning, etc. Health and Comfort in House Building, or Ventila tion with Warm Air by Self-Acting Suction Power, with Review of the mode of Calculating the Draught in Hot-Air Flues, and with some actual Experiments. By J. DRYSDALE, M.D., and J. W. HAYWARD, M.D. Second edition, with Supplement, with plates, demy 8vo, cloth, 75. 6d. Treatise on Watchwork, Past and Present. By the Rev. H. L. NELTHROPP, M.A., F.S.A. With 32 illustrations, crown 8vo, cloth, 6s. 6d. CONTENTS: Definitions of Words and Terms used in Watchwork-Tools-Time-Historical Summary-On Calculations of the Numbers for Wheels and Pinions; their Proportional Sizes, Trains, etc.-Of Dial Wheels, or Motion Work-Length of Time of Going without Winding up-The Verge-The Horizontal-The Duplex-The Lever-The Chronometer-Repeating Watches-Keyless Watches-The Pendulum, or Spiral Spring-Compensation-Jewelling of Pivot Holes-Clerkenwell-Fallacies of the Trade-Incapacity of Workmen-How to Choose and Use a Watch, etc. Spons Engineers' and Contractors' Illustrated Book of Prices of Machines, Tools, Ironwork, and Contractors' Material; and Engineers' Directory. Third edition, 4to, cloth, 6s. Algebra Self-Taught. By W. P. HIGGS, M.A., D.Sc., LL.D., Assoc. 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