Made to fill the need of the chemists for dependable piece of apparatus at a reasonable price. This Oven was the pioneer in this class of apparatus and still maintains its position as the lowest priced satisfactory constant temperature drying oven. It will produce any desired temperature between room temperature and 200°C. A workman-like piece devoid of the cast of ornamentation. Constancy of temperature 1°C. Size of chamber 10 x 10 x 12 inches. current. Furnished complete with thermometer, cord and plug for attaching to lamp socket. PRICE, $35.00 Descriptive circular on application. E. H. SARGENT & CO. IMPORTERS, MAKERS AND DEALERS IN CHEMICALS 155-165 EAST SUPERIOR STREET CHICAGO, ILL. ziv ! As Good as the Catalog Describes Them Kewaunee Aquarium, No. 1020. Very handsome and exceptionally well buil Truth in advertising demands that the printed word shall not even exaggerate the ar described, although many manufacturers still hold that a little "poetic license" in descrip is permissible in business. Kewaunee Laboratory Furnitur The Kewaunee Book, like Kewaunee Furniture, is straight realism. There is no ve on either. A letter from a discriminating School Executive says that "it gives one plea to find that the articles ordered are as good as the Catalog describes them." The Kewaunee Book will interest Superintendents and Teachers who are thinking of stalling Laboratory Equipment for Physics, Chemistry, Biology, Agriculture, Electri Domestic Science or Art, Manual Training or the Kindergarten. Ask for a copy, indica the subject in which you are interested. Address all inquiries to the factory at Kewaunee Pacific Sales Division: 6th Floor, Metropolitan Bldg. Los Angeles, Cal. Kewaunee Mfg. Co. LABORATORY 115 Lincoln Street KEWAUNEE. WIS. New York Office 70 Fifth Avenue Canadian Sales Divis 615 Yonge Street Toronto, Canada Branch Offi CHICAGO ALEXANDRIA, COLUMBUS LITTLE ROCK DALLAS DENVER SPOKANE OKLAHOMA Kewaunee Sand Table, No. 2103. A necessity in every Kindergarten Department JACKSON No Laboratory Equipment is complete without some variable resistances. To maintain the high standard of your outfit we suggest the addition of some "Becbro" Sliding Contact Rheostats (Tubular and Stone Types) Thousands of these rheostats have been manufactured and sold by us (the original American Manufacturers) to most all Universities, Colleges, Technical Schools and Industrial Concerns and have always given entire satisfaction. Write for Bulletin C-5 BECK BROS. 3640-42 North Second Street Philadelphia, Pa. H-ION DETERMINATIONS SIMPLIFIED The new Acree Apparatus with Pyrovolter Potentiometer is a unit outfit (not assembled), offering greater convenience and higher accuracy than any heretofore available. Even from a cost standpoint, it is worthy of your close investigation. Ask us for our New Price List of Apparatus for PH Pyrolectric Instrument Co. Grahame Chemical Company 636-640 East State Street TRENTON, N. J. 100 Rockingham Street Natural History Material ZOOLOGY MINERALOGY We have been handling Natural History Material of all kinds for the past fifty years, and so have accumulated a very complete stock. Our prices are as low as the quality of the specimens will permit. We are constantly preparing circulars and price lists covering our material in the different branches, which we will be pleased to send free of charge to the readers of Science. Some of our recent circulars: S-119 Cretaceous Fossils CONCHOLOGY GEOLOGY NEW SERIES FRIDAY, FEBRUARY 11, 192 SINGLE COPIES, 15 CTS. VOL. LIII, No. 1363 Prof. John C. Branner, Stanford University, Calif. Recent Blakiston Books GORDON-French-English Medi Dictionary A reference volume that has long been needed A new dictionary of modern French medical terms. With pronuncia- By ALFRED GORDON, M.D. (Paris), formerly Associate in Mental WILDER-A Laboratory Manual of Anthro pometry. Forty-three illustrations. Cloth, $3.00 postpaid. By HARRIS H. WILDER, Ph.D., Professor of Zoology, Smith College, COPAUX-LEFFMANN-Introduction to General Chemistry An exposition of the principles of modern chemistry Thirty illustrations. 12mo. x+195 Pages. Cloth, $2.00 postpaid. By H. COPAUX, Professor of Mineral Chemistry, School of Industrial Physics and Chemistry, Paris, France. Translated and with Appendix by HENRY LEFFMANN, A.M., M.D., Member American Chemical Society, and British Society of Public Analysis. SMITH-Priestley in America Activities in America of the man whom chemists everywhere 16mo. v+173 pages. Cloth, $1.50 postpaid. By EDGAR F. SMITH, University of Pennsylvania. P. Blakiston's Son & Co., Publishers, Philadelphia |