In connection with its trans-Atlantic flight the United States Navy, in cooperation with the Weather Bureau, arranged for meteorological reports from Europe, from the United States, and from ships at sea. These reports were forwarded by radio to the Weather Bureau at Washington, D. C., and to meteorologists, representing the Navy and the Weather Bureau, at Trepassey, N. F. Synoptic charts were regularly prepared, and forecasts furnished for the information of the aviators. Reports on May 16 indicated excellent conditions over the western part of the course, with parallel winds and clear weather; over the eastern part of the course, come cloudiness and possibly showers from low clouds, with little if any assistance from the winds; all in all, as nearly favourable conditions as could be expected for some time. The start was therefore made on that day. Reports of the seaplane commanders indicate that good flying weather prevailed, expect near the Azores, where low clouds, fog, and some rain were encountered. The NC–4, however, arrived safely at Horta and later successfully completed its journey to Lisbon and Plymouth. So far as the meteorologist is concerned, the principal points brought out by this first trans-Atlantic flight are: (1) Necessity of greater accuracy in barometric observations; (2) the great value of free-air observations; (3) needed improvement in radio apparatus; and (4) importance of accurate and regular meteorological reports from merchant and other ships at sea for the benefit and information of all marine shipping and aviation interests.