Aerology. Papers on aerological work: Aerological work of Weather Bureau during the war, [by] W. R. Gregg; Some scientific aspects of meteorological work of Signal Corps, [by] R. A. Millikan; Military meteorological service in United States during the war, [by] B. J. Sherry and A. T. Waterman; Two-theodolite plotting board, [by] W. C. Haines and R. A. Wells; Some observed irregular vertical movements of pilot balloons, [by] I. R. Tannehill; Work of aerographic section of Navy, [by] A. McAdie; Work of Naval Observatory in connection with naval aerography, [by] C. T. Jewell; Meteorology in naval aviation service overseas, [by] R. H. Finch; Blue Hill methods of pilot ballooning, [by] I. Mall; British pilot-balloon methods, Shoeburyness system.