Shall We Have a National Horse?--An eloquent plea by RANDOLPH HUNTINGTON for the production of a good type of animal.--Use of the Arabian horse as an improver of the breed. 9760 VIII. NAVAL ENGINEERING.--Trial Trip of the Ohio.--The remarkable results attained by the introduction of new boilers and machinery in an American steamship. 9751 IX. PHYSIOLOGY.--Apparatus for Determining Mechanically the Reaction Period of Hearing.--An interesting study of the time of transmission of an impulse through the sensor and motor nerves.--1 illustration. 9753 X. SANITATION.--A New Disinfector.--Description of a new apparatus for disinfecting by superheated steam and air, with tabular statement of elaborate tests made with it.--2 illustrations. 9754 Trees from a Sanitary Aspect.--By CHARLES ROBERTS, F.R.C.S., etc.--The sanitary value of trees considered by this eminent sanitarian.--The uses and abuses of shade near houses. 9765 XI. TECHNOLOGY.--A New Alkali Process.--The Parnell & Simpson process of making carbonate of soda, combining the features of the Leblanc and ammonia methods. 9755 A New Process for the Distillation and Concentration of Chemical Liquids.--By GEORGE ANDERSON, of London.--An apparatus and process especially adapted to the manufacture of sulphate of ammonia.--The invention of Alex. Angus Croll described.--1 illustration. 9757 Barlow's Machine for Moulding Candles.--A new apparatus for candle manufacture, fully described and illustrated.--5 illustrations. 9754 Temperature of Gas Distillation.--The mooted question discussed by Mr. WM. FOULIS, the eminent gas engineer. 9756 The Largest Black Ash Furnace in the World.--Note of a recent furnace for use in the Leblanc process of soda manufacture. 9756 * * * * * IMPROVED OSCILLATING HYDRAULIC MOTOR. The motor of MM. Schaltenbrand & Moller is adapted for use for household purposes, where small power is required, as in driving sewing machines.