. Two bird-lovers in Mexico. Natural history; Birds. :::::«v near the twin volcanos m::. MOTMOTS' TAILS, YOUNG MALE AND ADULT FEMALE ately for this theory, the habit is as strong in the one sex as in the other. When the feathers grow ont ane^v, althongh the barbs are all present, yet the vane at this point is narrower than elsewhere, perhaps showing that the continnal exercise of this habit for generation after generation is in some way having an hereditary effect. But we cannot be at all sure about this ; the inheritance of acquired characters is too unproved a theory to war- rant any such as
. Two bird-lovers in Mexico. Natural history; Birds. :::::«v near the twin volcanos m::. MOTMOTS' TAILS, YOUNG MALE AND ADULT FEMALE ately for this theory, the habit is as strong in the one sex as in the other. When the feathers grow ont ane^v, althongh the barbs are all present, yet the vane at this point is narrower than elsewhere, perhaps showing that the continnal exercise of this habit for generation after generation is in some way having an hereditary effect. But we cannot be at all sure about this ; the inheritance of acquired characters is too unproved a theory to war- rant any such assertion. The real cause of the habit would be a most interesting one to solve. In some of the birds which we saw the process had just begun, only a few barbs being torn away. «# 201 ^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Beebe, William, 1877-1962. London, A. Constable & company, ltd. , Boston, New York, Houghton, Mifflin
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Keywords: ., bookcentury1900, bookdecade1900, books, booksubjectnaturalhistory
