Boller's Practical Treatise on the Construction of Iron Highway Bridges. 8vo, 2 00 Burr and Falk's Influence Lines for Bridge and Roof Computations. 8vo, 3 00 Design and Construction of Metallic Bridges. 8vo, 5 00 Du Bois's Mechanics of Engineering. Vol. II. Small 4to, 10 00 Foster's Treatise on Wooden Trestle Bridges. 4to, 5 00 Fowler's Ordinary Foundations. 8vo, 3 50 Greene's Roof Trusses. 8vo, 1 25 Bridge Trusses. 8vo, 2 50 Arches in Wood, Iron, and Stone. 8vo, 2 50 Grimm's Secondary Stresses in Bridge Trusses. (In Press.) Howe's Treatise on Arches. 8vo, 4 00 Design of Simple Roof-trusses in Wood and Steel. 8vo, 2 00 Symmetrical Masonry Arches. 8vo, 2 50 Johnson, Bryan, and Turneaure's Theory and Practice in the Designing of Modern Framed Structures. Small 4to, 10 00 Merriman and Jacoby's Text-book on Roofs and Bridges: Part I. Stresses in Simple Trusses. 8vo, 2 50 Part II. Graphic Statics. 8vo, 2 50 Part III. Bridge Design. 8vo, 2 50 Part IV. Higher Structures. 8vo, 2 50 Morison's Memphis Bridge. 4to, 10 00 Waddell's De Pontibus, a Pocket-book for Bridge Engineers. 16mo, morocco, 2 00 * Specifications for Steel Bridges. 12mo, 50 Wright's Designing of Draw-spans. Two parts in one volume. 8vo, 3 50 HYDRAULICS.