THIS is a valuable volume for all Metal Workers;—the following are a few of the many subjects treated:

Materials.—Definitions; Qualities of Matter; Iron, Steel; Various Metals, Alloys, etc.; Gravity and Tables; Three Laws of Motion; Strength of Materials; Fatigue of Metals; Table of Melting Points of Solids; Useful Weights and Measures.

Shop Drawing.—Free-hand Drawing; Instruments; Penciling; Inking; Lettering Drawings; Dimensioning; Shading; Section-Lining; Reading Working Drawings; Problems in Geometrical Drawing—Points Relating to Drawing.

Gearing.—Cog Wheels, Spur and Bevel Wheels; Mitre Wheel; Mortise Wheel; Worm Gearing; Helical Wheel; Designing Gears; Speed of Gear Wheels.

Bench and Vice.—Tempering and Hardening Metals; Grades of Steel; Cementation Process; Bessemer and Siemen-Martin Process; Case-Hardening; Annealing; Hand Tools; Machine Tools; Work Benches; Sledge and Anvil; Surfacing; Red Marking; Hand Drilling; Broaching; Screw Cutting by Hand; Pipe Cutting.

Tools and Machines.—Machine and Hand Tools; Portable Tools; Action of Machines; Classification of Machine Work; Turning and Boring; Planing; Milling; Drilling; Grinding; Punching and Shearing.

Lathe Work.—Forms and use of Foot Lathes; Hand Lathes; Chuck or Surfacing Lathe; Engine Lathe; Parts of the Lathe; Cutting Tools Used in the Lathe; Tempering of Lathe Tools Rule; Lathe Practice; Measuring Instruments; Mandrels; Lathe-Dogs; Driving Work Between Centers; Turning Work Between Centers; Lathe Speed; Chuck and Face-plate Work; Drilling and Boring in the Lathe; Proportion of Parts of a Lathe; Useful References; Tables and Index.

Description of Binding.—The book is handsomely bound in black cloth, with gold edges and titles, printed on fine paper, illustrated with 330 diagrams and drawings of practical work, containing over 360 pages of valuable information, and 1081 ready reference index for quick information. This volume will be mailed to any address postpaid upon receipt of 2 dollars.