ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND AFFILIATED SOCIETIES1 Saturday, April 6: The Biological Society, at the Cosmos Club, at 8 p. m. Tuesday, April 9: The Anthropological Society, at Public Library, at 8 p. m. Program: PAUL HAUPT, Professor of the Semitic languages and Director of the Oriental Seminary in the Johns Hopkins University: Mesopotamia and Palestine. Wednesday, April 10: The Geological Society, at the Cosmos Club, at 8 p. m. Program: EDWIN KIRK: Paleozoic glaciation in Southeastern Alaska. H. E. MERWIN and E. POSNJAK: The iron-hydroxide minerals. J. B. MERTIE: Repeated stream piracy and other physiographic anomalies in the Tolovana district, Alaska. Thursday, April 11: The Chemical Society, at the Cosmos Club, at 8 p. m. Thursday, April 11: Society of American Foresters. Program: BENTON MCKAYE and L. S. MURPHY: Colonization and management of forest lands after the war. Saturday, April 13: The Philosophical Society, at the Cosmos Club, at 8 p. m. Monday and Tuesday, April 22 and 23: The National Academy of Sciences, at the Smithsonian Institution. A cordial invitation is extended by the President of the National Academy of Sciences to the members of the Washington Academy of Sciences to attend the scientific sessions and the public lectures. The William Ellery Hale Lectures will be given by Professor JOHN C. MERRIAM, Professor of Paleontology, University of California, on the subject: The Beginnings of Human History from the Geologic Record. These lectures will be held at 8 p. m. on Monday and 4 p. m. on Tuesday. Important reports on the work of the National Research Council will be presented at the scientific sessions. 1 The programs of the meetings of the affiliated Societies will appear on this page if sent to the editors by the thirteenth and twenty-seventh of each month. CONTENTS ORIGINAL PAPERS Page Geochemistry.-Note on the inorganic constituents of two small crusta ceans. F. W. CLARKE and B. SALKOVER.. 185 Geology. Correlation of the deposits of Jackson and Vicksburg ages in 186 199 This JOURNAL, the official organ of the Washington Academy of Sciences, aims to present a brief record of current scientific work in Washington. To this end it publishes: (1) short original papers, written or communicated by members of the Academy; (2) a complete list of references to current scientific articles published in or emanating from Washington; (3) short abstracts of certain of these articles; (4) proceedings and programs of meetings of the Academy and affiliated Societies; (5) notes of events connected with the scientific life of Washington. The JOURNAL is issued semi-monthly, on the fourth and nineteenth of each month, except during the summer when it appears on the nineteenth only. Volumes correspond to calendar years. 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C., to Williams & Wilkins Company, 2419-2421 Greenmount Ave., Baltimore, Md., or to the European Agents. European Agents: William Wesley & Son, 28 Essex St., Strand, London, and Mayer and Müller, Prinz Louis-Ferdinand Str., Berlin. Exchanges.-The JOURNAL does not exchange with other publications. Missing Numbers will be replaced without charge, provided that claim is made within thirty days after date of the following issue. • Volume I, however, from July 10, 1911, to December 19, 1911, will be sent for $3.00. Special rates are given to members of scientific societies affiliated with the Academy. THE WAVERLY PRESS BALTIMORE, U. S. A. AVIATION.-Aviation and the war. C. F. LEE, Commanding Officer, British Aviation Mission. (Communicated by L. J. Briggs.) I should much prefer to stand here and answer a few direct questions rather than to try to give you miscellaneous information on subjects connected with aviation. But there are representatives here of so many different sciences, men who are in the habit of asking and answering questions on such a variety of topics, that it is probably better that I do not attempt to answer any scientific questions at all on the theory of aviation, especially as my scientific knowledge of it is nil. Not everyone realizes how long a time it takes to make a service flyer. The average period, from the time that the pupil is brought to the cadet schools of the Flying Corps to the time he is ready to go over-seas and fly over the lines, is about seven months. That is a very considerable length of time, especially in these days of intensive training and preparation, yet the actual training in flying is one of the simplest items. The principal factor to consider in teaching flying in war time is whether it is worth while to spend the necessary time on a pupil. If a country is at peace and there are plenty of machines available, it may pay to stick to a man who will undoubtedly make a flyer sooner or later, for anyone can fly if sufficient time be given to his instruction. But in times of war when, as at the present time, we 1 Report of a lecture given before the Washington Academy of Sciences on Thursday, March 7, 1918. |