The Sinaloa Colony.--The Topolobampo settlement; its origin, progress, principles and prospects 9301 IX. NAVAL ENGINEERING.--Torpedo Boat Catchers. A review of recent constructions of fast light armored vessels for combating torpedo boats 9290 X. ORDNANCE.--The Use of Machine Guns in the Field in Combination with Infantry.--Abstract of a recent paper on this subject by Major A. D. ANDERSON, R.H.A.--The advantages and uses of the weapon discussed.--Advocacy of their introduction 9288 XI. PHOTOGRAPHY.--Orthochromatic Photography. By J. B. B. WELLINGTON.--Formulæ and practical directions for orthochromatic work.--The use of silver carbonate and erythrosin together 9293 XII. PHYSICS.--A New Gas Thermo-Regulator.--A simple and efficient apparatus for regulating heat in air baths, etc.--1 illustration 9292 A New Thermometer.--The principle of the Bourdon safety gauge applied to thermometry.--Fermis' new thermometer.--1 illustration 9291 Phosphorescence of Alumina.--By EDMOND BECQUEREL.--The effects of impurities on phosphorescence discussed 9294 Separation of Nickel by the Magnet.--By THOMAS T. P. BRUCE-WARREN.--The effect of copper on nickel in modifying its susceptibility to magnetic attraction.--Practical deductions as to nickel crucibles and gauze 9294 The Capillarity and Density of Liquids.--A simple experiment in physics without apparatus.--1 illustration 9294 XIII. SANITATION AND HYGIENE.--A Floating Hospital.--A new structure recently erected at Newcastle-on-Tyne.--2 illustrations 9295 XIV. TECHNOLOGY.--Employment of Acetic or Formic Acid in Bleaching.--Ingenious use of a small quantity of organic acids to decompose indefinite amounts of bleaching powder.--The invention of Dr. Lunge, of Zurich 9290 Sulphurous Acid in the Chemical Industries.--Its use in the phosphate and tartaric acid industries 9294 Tea Withering Apparatus.--A portable blowing apparatus for drying tea.--Use of chloride of calcium to absorb moisture therein.--1 illustration 9291 NEW AMENDMENT OF THE DESIGN PATENT LAW. An amendment of the patent law relating to design patents has lately passed both houses of Congress and received the approval of the President. The object of the amendment is to correct a defect in the law, which prevented the patentee from collecting damages in cases of infringement.