292 



SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



A',. Photograph of bird in soaring position, suspended horizontally. 

 A'... Same, enlarged to natural size. 



/•',. Photograph of bird in soaring position, suspended vertically. 

 F,. Same, enlarged to natural size. 



G. Tracing of wing in soaring position, from which the compo-board pat- 

 tern l> was made. 



Exhibit ]•',. -Turkej Buzzard suspended vertically in soaring position. ( R. P. Currie.) 



//. Wing preserved in formalin, on which the center of gravity is recorded. 

 /. Tracing of wing // when frozen in soaring position, on which the center 

 of gravity is marked. 



./. Wing with muscle removed, on which the center of gravity is shown. 



Several persons connected with the Smithsonian Institution and U. S. Na- 

 tional Museum have contributed towards securing the results herewith sub- 

 ted. Among them, I desire especially to mention Mr. W. H. Holmes, Mr. 



