. Biology in America. Biology. The Factors of Evolution 247 evolution in the potato beetle. The same experiment has been performed in Nature's laboratory by transferring beetles from the relatively cool, moist climate of Chicago to the hot arid air of Tucson, Arizona. As a result of this transfer not only are morphological (color) changes induced, but physiological ones as well. ' The beetles gradually acquire the power to re-. MUTATIONS IN THE PoTATO BEETLE 2 represents a type derived experimentally from 1 by the use of high temperature. 5 was derived from 4 by using high temperature and rela
. Biology in America. Biology. The Factors of Evolution 247 evolution in the potato beetle. The same experiment has been performed in Nature's laboratory by transferring beetles from the relatively cool, moist climate of Chicago to the hot arid air of Tucson, Arizona. As a result of this transfer not only are morphological (color) changes induced, but physiological ones as well. ' The beetles gradually acquire the power to re-. MUTATIONS IN THE PoTATO BEETLE 2 represents a type derived experimentally from 1 by the use of high temperature. 5 was derived from 4 by using high temperature and relative humidity and 7 from 8 by high temperature and low humidity. From Tower, " li]volution in Chrysomelid Beetles," Carnegie Institution, Publication No. 48. tain more water in their tissues during hibernation, and thereby to resist the effects of the dry climate. They show also certain changes in their responses to stimuli. These changes moreover are not reversible, but persist when the beetles are returned to their original home at Chicago. They. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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