. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PHENOMENA OF FLIGHT IN TTJV AxiTArAr uiii IN THE ANIMAL KINGDOM 255. nuiii verj shorl^ ^^ '"°^' ''^^^^ the ster- ol , A-"I'-'^'^^'-'u lu Lue extent of that surface; other tliiugs 1 eiifi the same, a greaterexertron Is re" quired to move a hir-e win ' than one of less superficial elctent that the difierence in the form of the pectoral muscles iu differ^ eut birds accords with the diflbr- euces presented in the manner m ^hich t
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PHENOMENA OF FLIGHT IN TTJV AxiTArAr uiii IN THE ANIMAL KINGDOM 255. nuiii verj shorl^ ^^ '"°^' ''^^^^ the ster- ol , A-"I'-'^'^^'-'u lu Lue extent of that surface; other tliiugs 1 eiifi the same, a greaterexertron Is re" quired to move a hir-e win ' than one of less superficial elctent that the difierence in the form of the pectoral muscles iu differ^ eut birds accords with the diflbr- euces presented in the manner m ^hich thej perform their re spective work. Two birds of the iaboi m flyiuo-, ^nd apparentlv should have muscles of the same wht^. I 7^ thtterences in form tTV J^ ^^ ^'^^^e indicated, we see Uiattheworkisdoneindifferln? wa s _ The birds with small ^Jiigs increase the small resist aoce which these offer to tlie ah- But, It be said mtnvr. might have attained tl e:se liffbr ent methods of flight bv gh^cr muscles of uniform%roani?al "S toall birds. It would have beeu snftcient to have given difent pasitions to the point of attach- ment of the great pectoral to the humerus, or, in other words to vaiy the length of the arm of the res stance. Comparative anat- ral is always attached close to Jifi "^?^"^^ (distance .Miich sep- arates tins attachment from the center of motion of the hurerus with the form of the bird and not according- to the rela ive v greater or less extent of thi wing-s. This last depends prince ??i^/"^»,,^^^^l^"8thofthefoi"- aim and its appendages. It is Kls^of dT^ to dissl^ct many f]il/^'^^''^^t kinds to prove the constancy of the law which I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Repo
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