Note 93 — PROGRESSION IN OR THROUGH THE AIR. (continued 2)
Reading edition
“The humerus varies extremely in length, being very short in the swallow, of moderate length in the gallinaceous birds, longer in the crows, very long in the gannets, and unusually elongated in the albatross. In the golden eagle it is also seen to be of great length.”—Macgillivray’s British Birds, vol. i. p. 30.