Smithsonian Report, 1923. — Miller 



Plate 2 



A. The Beginning of the Stroke 



B. The Completion of the Stroke 



C. Wings Advanced on the Downstroke (Left) and Retired on the 



Upstroke (Right) 



D. Five Different Phases of the stroke 



E. Rapid Movement of the Wing Tip 



F. The Use of Feet and Tail for Retarding Flight 



