Abstract
HAVING all my life given some attention to the flight of birds, I may mention that I have frequently noticed both hawks and gulls stationary in the air, without flapping, for five or six seconds over the Cornish cliffs when the wind has been blowing off the sea, but never under the circumstances mentioned by Dr. Rae. I totally fail to see why Mr. Airy should be, as the Duke of Argyll states (NATURE, vol. xxvii. p. 387), “mistaken in his description of the facts,” it having been plain throughout that Mr. Airy employs the term “hovering” as equivalent to “hanging in motionless poise.” Mr. Wolf's kestrel in the “Reign of Law,” p. 160, is shown as moving its wings through an angle of about 30°.
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