THE CHEMICAL NEWS JAN 15 1900 CAMBRID Edited by AND JOURNAL OF PHYSICAL SCIENCE Sir Wm. Crookes, F.R.S.] (WITH WHICH IS INCORPORATED THE "CHEMICAL gazette") Vol. 81.-No. 2093.] Copyright Friday, January 5, 1900. ARTICLES: reserved. CONTENTS. PAGE The Relation between Boiling-point and Melting-point in the On the Theory of the Action of Carbonic Oxide on Dissolved Fluorine in the Mineral Waters of Spain and Portugal, by A. J. On the Analysis of Vulcanised Indiarubber, by Carl Otto Weber and De Forest Baldwin ..... PROCEEDINGS OF SOCIETIES CHEMICAL SOCIETY..... CORRESPONDENCE. .......... ............ I 3 7 8 Established Fifty-three Years. Registered as [PRICE 4d. INDUCTION COILS, FOCUS TUBES, BATTERIES, &c. FOR RÖNTGEN RAY PHOTOGRAPHY, PERKEN, SON, & RAYMENT, 99, Hatton Garden, Holborn Viaduct, LONDON. The above well known work has just been thoroughly revised, and the large number of alterations made since 1896 in Continental and Foreign Patent Laws have been summarised in an Addendum cor. rected to December, 1898. Price complete, 2s. 6d. W. P. THOMPSON & CO., Patent Agents, 6, Lord Street, Liverpool; 6, Bank Street, Manchester; 322, High Holborn, London, W.C. IMPERIAL COLLEGE OF CHEMISTRY, 49 & 51, IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. Principal-FREDERICK DAVIS. Chemist, with good experience and some An especial Course of Instruction has been knowledge of Pharmaceutical Chemistry, aged thirty to forty, wanted by an Irish manufacturing firm. Must be competent to control men.-Apply, with fullest information and copies of testimonials, 101. M., CHEMICAL NEWS Office, 6 & 7, Creed Lane, Ludgate Hill, London, E.C. Managing Chemist, Ph.D., thoroughly experi- Conscientious scientific worker; patentee. organised for Fellows and Associates of the Institute of Chemistry, to meet the requirements of the Local Government Board, in Therapeutics, Pharmacology, and Microscopy, as recommended by the Council of the Institute. CHEMISTRY, PHYSICS, BIOLOGY, MATHEMATICS. Personal and Class tuition and Research Work in well-equipped Laboratories. Powerful electric currents. HEATHCOTE SCIENCE LABORATORIES, Heathcote St., Gray's Inn Road. Required, Lad for Analytical Laboratory CHEMICALS, Pure and Commercial. W London, E.C. ST. Will PAUL'S SCHOOL, LONDON. An Examination for filling up Vacancies on the Foundation For CHEMISTS AND ASSAYERS. CRACKING MINIMISED. For information apply to the Bursar of St. Paul's School, West be held on the 16th, 17th, 18th, 19th, and 22nd instant. A valuable improvement in Laboratory Furnaces. Kensington. AMMONIA.-All Qualities and Strengths. Enquiries solicited. BROTHERTON & CO., COMMERCIAL BUILDINGS, LEEDS. SOLE MAKERS: JOHN J. GRIFFIN & SONS, LTD 0-26, SARDINIA STREET, LINCOLN'S INN FIELDS, W.C, |