Investigation and assembling of experiments and theories to describe the mechanisms that birds use in flight, with particular interest in hummingbirds. Discussion and exchange of views with other scientists, including Dr. Dean Amadon, American Museum of Natural History; Dr. E. Thomas Gilliard, American Museum of Natural History; Dr. Herbert Friedman, Smithsonian Institution; Dr. Vannevar Bush; Dr. Rene H. Miller, MIT; Dr. Robert W. Storer, University of Michigan; Dr. D.B.O. Savile, Plant Research Institute, Ottawa; Andrew J. Berger, University of Michigan; Dr. Kenneth D. Roeder, Tufts University; Frank A. Hartman, The Ohio State University; Charles H. Blake, MIT; Dr. Torkel Weis-Fogh, Harvard University; Dr. Oliver P. Pearson, University of California-Berkeley; Dr. Hans Oehme, Deutsche Akadamie der Wissenschaften zu Berlin; Dr. S. Dillon Ripley, Yale University, Dr. Olavi Sotavalta, Helsinki, Finland; Dr. J.W.S. Pringle, Oxford University; Dr. Erwin Stresemann, Berlin; and Dr. James L.G. Fitzpatrick, Staten Island Community College.