COLOR CHANGES IN LEPUS AMERICANUS AND OTHER ANIMALS

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Abstract
Observations on the color changes of Lepus americanus are recorded and discussed. Melanin is shown to be lacking in the white winter hair but plentiful in the dark summer hair, especially in the roots, thereby protecting the animal from sunburn. In view of the observations on experimental animals it is considered that the color changes of Lepus americanus are due, not to local environmental factors, but to an inherited habit. The conclusion is reached that color changes are primarily for the summer exclusion and winter retention of heat and for protection against ultra-violet light. (G.B.T.)

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