The Spanish Patent covers SPAIN, and all the Spanish Colonies, including CUBA, Porto Rico, the Philippine Islands, etc. Total cost of obtaining the Patent, $100. Duration of the Patent, 20 years, 10 years, and 5 years, as follows: The Spanish Patent, if applied for by the original inventor before his American patent is actually issued, will run for 20 years. Total cost of the patent, $100. It covers Spain, Cuba, etc. The Spanish Patent, if applied for by the original inventor not more than two years after the American patent has been issued, will run for 10 years. Total cost of patent, $100. Covers Spain, Cuba, etc. _A Spanish Patent of Introduction_, good for 5 years, can be taken by any person, whether inventor or merely introducer. Cost of such patent, $100. Covers Spain, Cuba, and all the Spanish dominions. In order to facilitate the transaction of our business in obtaining Spanish Patents, we have established a special agency at No. 4 Soldado, Madrid. Further particulars, with Synopsis of Foreign Patents, Costs, etc., furnished gratis. MUNN & CO., Solicitors of American and Foreign Patents, Proprietors of the SCIENTIFIC AMERICAN, 37 PARK ROW, NEW YORK. * * * * * WATER SUPPLY FOR TOWNS AND Villages.--By Clarence Delafield, C.E. A concise and valuable report, showing the costs and merits of the various systems--Discussion of the Holly system, its merits and defects--The reservoir system, with pumps, cost, and advantages--Results obtained and economy of use of various systems in different towns, with names and duty realized--Facts and figures to enable town committees to judge for themselves as to the system best suited for their wants--The best sources of water supply-- Water-bearing rocks--Artesian wells, their feasibility, excellence, and cost of boring--Importance of pure water--How surface water is rendered impure--Cost of water pipes, from 2 to 12 inches diameter, for towns, including laying, all labor, materials, gates, joints, etc. Estimates of income, water-rates for supply of 1,000 buildings. Contained in SUPPLEMENT 27. Price 10 cents. * * * * * ICE BOATS--THEIR CONSTRUCTION and management. With working drawings, details, and directions in full. Four engravings, showing mode of construction. Views of the two fastest ice-sailing boats used on the Hudson river in winter. By H. A. Horsfall, M.E. SUPPLEMENT 1. The same number also contains the rules and regulations for the formation of ice-boat clubs, the sailing and management of ice-boats, etc. Price 10 cents. * * * * * ICE AND ICE-HOUSES--HOW TO MAKE ice ponds; amount of ice required, etc., and full directions for building ice-house, with illustrated plan. SUPPLEMENT 55. Price 10 cents. * * * * * [Illustration: Patents] CAVEATS, COPYRIGHTS, TRADE MARKS, ETC.