Abstract
IN reviewing Prof. Eigenmann's book on the cave vertebrates of America (NATURE, November 11, p. 40), the reviewer quotes the author's opinion that “The bleached condition of animals living in the dark, an individual environmental adaptation, is transmissible, and. finally becomes hereditarily fixed.... Natural selection cannot have affected the coloration of the cave forms, for it can be of no consequence whether a cave species is white or black”. Your reviewer further dismisses Romanes's supposition that colour may be correlated, with other structures which are subject to selection.
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