370
JOURNAL OF CHEMICAL EDUCATION
F s s n u m ~1930 ,
joint papers with Society members, and no papers may be presented at a meeting unless the title has been printed on the final program. Titles for papers designed to be read before the Division of Chemical Education should be sent to the Secretary (R. A. BAKER, Syracuse University, Syracuse, New York) of the Division as soon as possible. Be sure to state whether or not a lantern will be required. The completed paper, accompanied by an abstract (in duplicate) of about 100 words must reach the Secretary not later than February 25th. Papers received after this date will be held over, with the consent of the authors, for the September meeting. Papers read before the Division become the property of the Division, and, if acceptable for publication, will appear later in THISJOURNAL. Since the time available for the reading of papers will be strictly limited, each author is requested to condense his material, leaving time for adequate critical discussion which is the chief function of our program meetings. In general only 15 minutes, including discussion, may be allotted to each paper. Special Student Rates Regularly matriculated students majoring in chemistry in any college or university will be registered for the entire meeting for $3.00 which is the differential fee charged regular members of the Society. Sleeping accommodations will also be provided for them in the headquarters hotel at $1.00 per night. To insure this concession, arrangements must be made i n advance of April first through the Local Secretary of the Division, MR. M. A. GAERTNER, 39 East Drive, Atlanta, Georgia. R. A. BAKER, Secretary, Syracuse University, Syracuse, New York Vacuum Tube Produces Artificial Radium Rays. Artificial radium rays, produced by 1,600,000 volts of electricity in special vacuum tubes, have now been achieved by physicists a t the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. At the Institution's recent annual exhibit of its research activities, the tubes for producing these rays are being shown. The tubes are really X-ray tubes, and by applying voltages of from one-half t o several million, rays similar to the gamma rays of radium are emitted. The other kinds of radium rays, known as alpha and beta rays, can he produced by suitably modifying such a tube. With the aid of these rays, the Carnegie physicists are studying the structure of the heart of the atom. The tube is composed of many separate X-ray tubes, with the rays feeding from one into the next. The entire battery of tubes is immersed in oil, while each one is individually shielded from the others. This makes possible smaller tubes, and higher voltages, than Dr. W. D. Coolidge, of the General Electric Co., used in a somewhat similar experiment.-Science Sem'ce
