NO. 3 APPENDIX 291 



10. The weight of the dissected wing. — 



a. With all muscle up to the ball and socket joinl intact, 325 grammes. 



b. Willi all muscle removed, 190 grammes. 

 Weight of muscle, therefore, 1 35 grammes. 

 The position of the root of the tail. — 



a. In the horizontal plane, 11. S inches in fronl of the tip of the longest tail 

 feather; 14.2 inches behind tip of beak. 



b. In the vertical plane: (depth (if body from ventral point below rool of tail 

 to a point directly above, winch is on a level with the highest poinl of the hack. 

 '2.5 inches.) 1.5 inches above ventral point, 1 inch below dorsal point. 



Weight of tail. — With muscle, 40 grammes; without muscle, 30 grann 

 Weight of muscle, therefore, 10 grammes. 



EXHIBITS ACCOMPANYING THESE MEMOEANDA 



Exiiiuit E,.— Turkey Buzzard suspended in soaring position. (R. P. Currie.) 



A x and A 2 . Two sheets, comprising a tracing of the entire turkey buzzard 

 with fully outstretched wings. From these the area of the wings and the dis- 

 tance between their tips was obtained. The position of the root of the wing ami 

 the root of the tail is also marked on one of these sheets. 



B. One sheet, comprising a tracing of a single win,--, and from which the 

 area was also computed. This area, multiplied by •_', .yivos the same result as the 



sum of both wings on A, and A,. Th< mpo-board pattern C was made from this 



tracing. 



C. Compo-boai'd pattern of fully extended wing, on which the center of 

 pressure is indicated. 



D. Compo-board pattern of wing in soaring position, on which tl enter 



of pressure is shown. 



