Graphical representation of the compensation of asymmetry in the constituent structures of the wing and the maintenance of wing area. The height of the wing remains in the various plans through inverse variation in the size of structures 3 with 4 and 4 with 2. At length the maintenance is done by varying inversely in size from 1 to 5. 1 forearm 2 second phalanx of the fifth digit 3 fourth metacarpal of the digit 4 first phalanx of fourth digit, and 5 first phalanx of third digit.