Correspondence with United States observatories and universities, including P. van de Kamp of the Sproul Observatory, Swartmore, Pennsylvania; Mrs H.F. Czaplicki of the Hale Observatories, Pasadena, California; Miss P. Hughes and T. Thomas of the Institute of Marine and Atmospheric Sciences, University of Miami, Florida; G.E. Kron of the United States Naval Observatory, Flagstaff, Arizona; A.A. Hoag of the Kitt Peak National Observatory, Tucson, Arizona; C.B. Waff of the John Hopkins University, Baltimore, Maryland; W.J. Quirk of the Mount Wilson and Palomar Observatories, Pasadena, California; A. Weber of Fordham University, Bronx, New York; J.L. Bensing, B. Ford Institute of Medical Research, Detroit, Michigan; James M. Goodwin of the Stanislaus State College, Turlock, California; F.H. Giles, Junior, of the University of South Carolina, Columbia; and R.B. Loren of the University of Texas, Austin.