During the past year the principal collective activity of your Committee has been concentrated on completing the plans and the execution of the gravimetric and submarine topographic expedition to the West Indies. Your Chairman, together with Dr. Maurice Ewing and Dr. H. K. Hess, served as a subcommittee with Captain L.R. Leahy, Hydrographer of the United States Navy. Dr. Ewing was appointed chief scientist of the expedition, and was assisted by Lt. A. J. Hoskinson of the United States Coast and Geodetic Survey and Dr. Hess. Relatively late in the plans, it was decided to attempt to change the method of timing the pendulums. This would have proved a somewhat dangerous decision had it not been for the fundamental cooperation of the Bell Telephone Laboratories of New York, which, through its President, Dr. F. B. Jewett, and Mr. W. A. Marrison, provided a crystal chronometer, which was adapted to the Vening Meinesz apparatus. The Committee is deeply indebted to Mr. Marrison for this great improvement in the determination of gravity on land, as well as at sea.