Letter | Published:

On the Soaring of Birds



IT is a pity that so many of your correspondents on this subject fail to grasp the elementary and self-evident fact that no common horizontal movement, relatively to the surface of the earth, of the air in which a bird is immersed can by any possibility enable it to soar. Upward convection-currents and upward slants may have something to do with the question, as may also the existence of different horizontal currents.

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