VI. METALLURGY.--Chapin Wrought Iron.--By W.H. SEARLES.--An interesting account of the combined pneumatic and mechanical treatment of pig iron, giving as product a true wrought iron. 9785 VII. METEOROLOGY.--On the Cause of Iridescence in Clouds.--By G. JOHNSTONE STONEY.--An interesting theory of the production of prismatic colors in clouds, referring it to interference of light. 9798 The Height of Summer Clouds.--A compendious statement, giving the most reliable estimation of the elevations of different forms of clouds. 9797 VIII. MISCELLANEOUS.--The British Association.--Portraits of the president and section presidents of the late Manchester meeting of the British Association for the Advancement of Science, with report of the address of the president, Sir Henry E. Roscoe.--9 illustrations. 9783 IX. PHYSIOLOGY.--Hypnotism in France.--A valuable review of the present status of this subject, now so much studied in Paris. 9795 The Duodenum a Siphon Trap.--By MAYO COLLIER, M.S., etc.--A curious observation in anatomy.--The only trap found in the intestinal canal.--Its uses.--2 illustrations. 9796 X. TECHNOLOGY.--Apparatus for Testing Champagne Bottles and Corks.--Ingenious apparatus due to Mr. J. Salleron, for use especially in the champagne industry.--2 illustrations. 9786 Celluloid.--Notes of the history and present method of manufacture of this widely used substance. 9785 Centrifugal Extractors.--By ROBERT F. GIBSON.--The second installment of this extensive and important paper, giving many additional forms of centrifugal apparatus--12 illustrations. 9789 Cotton Industries of Japan.--An interesting account of the primitive methods of treating cotton by the Japanese.--Their methods of ginning, carding, etc., described. 9788 Gas from Oil.--Notes on a paper read by Dr. Stevenson Macadam at a recent meeting of the British Gas Institute, giving his results with petroleum gas. 9787 Improved Biscuit Machine.--A machine having a capacity for making 4,000 small biscuits per minute.--1 illustration. 9787 Improved Cream Separator.--A centrifugal apparatus for dairy use of high capacity.--3 illustrations. 9787 The Manufacture of Salt near Middlesbrough.--By Sir LOWTHIAN BELL, Bart., F.C.S.--The history and origin of this industry, the methods used, and the soda ash process as there applied. 9788 * * * * *