No. 17. - Water And Water Supply. By Prop. W. II. Corpield, M. A., of the University College, London.

No 18. - Sewerage And Sewage Utili-Zatk >X. By Prof. W. II. Corpield, M. A., of the University College, London.

No. 19. - Strength Of Beams Under Transverse Loads. By Prof. W. Allen, Author of "Theory of Arches." With Illustrations.

No. 20. - Bridge And Tunnel Centres. By John B. McMasters, C. E. With Illustration

No. 21. - Safety Valves. By Richard II. Buel, ('. E. With Illustrations.

No. 22 - High Masonry Dams. By John B. . McMasters, V. E. With Illustrations.

No. 23. - The Fatigue Of Metals Under Repeated Strains, with various Tables of Results of Experiments. From the German of Prop. Ludwig Spangen-bero. With a Preface by S. H. Shreve, A. M. With Illustrations.

No. 24. - A Practical Treatise On The Teeth Of Wheels, with the Theory of the Use of Robinson's Odonto-fraph. By S. W. Robinson, Prof. of Mechanical Engineering. Illinois Industrial University.

No. 25. - Theory And Calculations Of Continuous Bridges. By Mansfield Merrlman, C. E. With Illustrations.

No. 26. - Practical Treatise On The Properties Of Continuous Bridges. By Charles Bender, C. E.

No. 27. - On Boiler Incrustation And Corrosion. By F. J. Rowan.

Works By The Same Author

Diagram For Sewer Calculations, constructed from Tables in Baldwin Latham's Sanitary Engineering, and calculated from Weisbach's Formulæ. Price 75 cents.

"A useful little diagram, exhibiting at a glance the relations between discharge, velocity, rate of inclination, and diameter of circular sewers from 3 to 36 inches diameter. Any two of these quantities being given, the lines on the diagram enable the others to be obtained by simple inspection."

- The Sanitary Engineer.

Anlagen Von Haus-Entwasseeungen

Nach Studien Amerikanisoher

Verhaltnisse. Price 80 cents.

"The young engineer or architect, or the to telligent householder, can get from these thirtysix pages all that he would probably be able to glean from the ponderous volumes of Latham and Denton. with a considerable amount of desultory reading and practical experience in addition. . . . We can assure . . . our . . . that this little pamphlet will help them more to sound and practical knowledge than any work with which we are ac-quainted, even of many time- its bulk."

- The American Architect and Building News.