Meetings were held daily, except Sunday, from May 4 to 9, inclusive, and in addition a joint meeting with Section (D), Terrestrial Magnetism and Electricity, was held on May 5. Sir Napier Shaw of England presided at all the meetings. In the absence of Professor Marvin, the Secretary, Dr. Kimball, the delegate from the United States, was asked to serve as Secretary pro tem; and Professors Platania and Eredia, delegates from Italy, were designated Assistant Secretaries.In all, thirty‐three delegates were in attendance, representing most of the allied nations, and a few that were neutral, during the world wa