Roxburgh, W. General Foundry Practice. (Westminster Series.). 8vo, *2 00 Ruhmer, E. Wireless Telephony. Trans. by J. Erskine-Murray. 8vo, *3 50 Russell, A. Theory of Electric Cables and Networks 8vo, *3 00 Rutley, F. Elements of Mineralogy 12mo, *1 25 Sanford, P. G. Nitro-explosives 8vo, *4 00 Saunders, C. H. Handbook of Practical Mechanics 16mo, 1 00 leather, 1 25 Sayers, H. M. Brakes for Tram Cars 8vo, *1 25 Scheele, C. W. Chemical Essays 8vo, *2 00 Scheithauer, W. Shale Oils and Tars 8vo, *3 50 Scherer, R. Casein. Trans. by C. Salter 8vo, *3 00 Schidrowitz, P. Rubber, Its Production and Industrial Uses 8vo, *5 00 Schindler, K. Iron and Steel Construction Works 12mo, *1 25 Schmall, C. N. First Course in Analytic Geometry, Plane and Solid. 12mo, half leather, *1 75 Schmeer, L. Flow of Water 8vo, *3 00 Schumann, F. A Manual of Heating and Ventilation 12mo, leather, 1 50 Schwarz, E. H. L. Causal Geology 8vo, *2 50 Schweizer, V. Distillation of Resins 8vo, *3 50 Scott, W. W. Qualitative Analysis. A Laboratory Manual 8vo, *1 50 ---- Standard Methods of Chemical Analysis 8vo, *6 00 Scribner, J. M. Engineers' and Mechanics' Companion 16mo, leather, 1 50 Scudder, H. Electrical Conductivity and Ionization Constants of Organic Compounds 8vo, *3 00 Searle, A. B. Modern Brickmaking 8vo, *5 00 ---- Cement, Concrete and Bricks 8vo, *3 00 Searle, G. M. "Sumners' Method." Condensed and Improved. (Science Series No. 124.) 16mo, 0 50 Seaton, A. E. Manual of Marine Engineering 8vo, 8 00 Seaton, A. E., and Rounthwaite, H. M. Pocket-book of Marine Engineering 16mo, leather, 3 50 Seeligmann, T., Torrilhon, G. L., and Falconnet, H. India Rubber and Gutta Percha. Trans. by J. G. McIntosh 8vo, *5 00 Seidell, A. Solubilities of Inorganic and Organic Substances 8vo, 4 50 Seligman, B. Aluminum. (Metallurgy Series.) (_In Press._) Sellew, W. H. Steel Rails 4to, *10 00 ---- Railway Maintenance Engineering 12mo, *2 50 Senter, G. Outlines of Physical Chemistry 12mo, *1 75 ---- Text-book of Inorganic Chemistry 12mo, *1 75