(911) AGAMEMNON, 1919 FD. This planet was discovered by Reinmuth' at Heidelberg on March 19, 1919. The nature of its motion (Jupiter group) was noted about the same time by Palisa and Berberich.2 The preliminary elements A by Berberich are published in A. N. Vol. 208, p. 332. A comparison between computation and observations for 1919 May 20, gives Δα = -4 Δδ = -2. Elements A are brought forward to mean equinox of 1925.0 and with an ephemeris are published in Kleine Planeten for 1920, p. 25 and p. 47. An observation on March 11, 1920, gives a correction to the ephemeris of +1m.5 in right ascension and -18' in declination. An ephemeris for 1921 is given in Kleine Planeten for 1921, p. 20. A 1919 Mar. 19.5 Grw. 88°48′19′′ 78°46′08′′ 336°55′10′′ 21°56′50′′ $ 4°55'43" μ Equinox Authority 303".190 1919.0 Berberich. Remarks Preliminary orbit. TABLE 22.-References for Observations of (911) Agamemnon (1919 FD) Bulletin Series Volume 1 Number 1. The national importance of scientific and industrial research. By George Ellery Hale and others. October, 1919. Pages 43. Price $0.50. Number 2. Research laboratories in industrial establishments of the United States of America. Compiled by Alfred D. Flinn. March, 1920. Pages 85. Price $1.00. [Out of print. See Number 16.] Number 3. Periodical bibliographies and abstracts for the scientific and technological journals of the world. Compiled by Ruth Cobb. June, 1920. Pages 24. Price $0.40. Number 4. North American forest research. Compiled by the Committee on American Forest Research, Society of American Foresters. August, 1920. Pages 146. Price $2.00. Number 5. The quantum theory. By Edwin Plimpton Adams. October, 1920. Pages 81. Price $1.00. [Out of print.] Number 6. Data relating to X-ray spectra. By William Duane. November, 1920. Pages 26. Price $0.50. Number 7. Intensity of emission of X-rays and their reflection from crystals. By Bergen Davis. Problems of X-ray emission. 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By members of the Committee on Theories of Magnetism of the National Research Council. A. P. Wills, S. J. Barnett, L. R. Ingersoll, J. Kunz, S. L. Quimby, E. M. Terry, S. R. Williams. August, 1922. Pages 261. Price $3.00. Volume 4 Number 19. Celestial mechanics. Report of the Committee on Celestial Mechanics of the National Research Council. E. W. Brown, G. D. Birkhoff, A. O. Leuschner, H. N. Russell. September, 1922. Pages 22. Price $0.40. Number 20. Secondary radiations produced by X-rays, and some of their applications to physical problems. Arthur H. Compton. October, 1922. Pages 56. Price $1.00. Number 21. Highway research in the United States. Results of census by Advisory Board on Highway Research, Division of Engineering, National Research Council, in coöperation with the Bureau of Public Roads, United States Department of Agriculture. William Kendrick Hatt. October, 1922. Pages 102. Price $1.50. Number 22. 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