Quite a hefty volume, with six issues for the last half of 1889, each issue in and of itself substantial. The issues are contain:~(1) July. Theodore Cooper. AMERICAN RAILROAD BRIDGES, with photographic illustrations and many folding plates of railroad bridges; (2) August. R. E. Peary. SHIP CANALS IN 1889, with a number of folding plates and charts; (3) D. J. Whittemore. CYLINDRICAL WHEELS AND FLAT TOPPED RAILS FOR RAILWAYS. With many folding plates; (4) REPORT OF COMMITTE ON THE PROPER RELATION TO EACH OF ...RAILWAY WHEELS AND RAILS. Folding charts and drawings; (5) John Freeman. EXPERIMENTS ON HYDRAULICS OF FIRE STREAMS. With photographs of fire engine hoses as well as charts; (6) FRESH WATER ALGAE AND THEIR RELATION TO THE PURITY OF PUBLIC WATER SUPPLIES. Plates and folding charts.~The whole in a later quite sturdy and serviceable blue cloth binding. 612 pp.