Progressive Change in the Insect Population of Forests Since the Early Tertiary Author(s): Charles T. Brues Source: The American Naturalist, Vol. 67, No. 712 (Sep. - Oct., 1933), pp. 385-406 Published by: The University of Chicago Press for The American Society of Naturalists Stable URL: http://www.jstor.org/stable/2456768 . Accessed: 25/08/2011 13:43 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
[email protected]. The University of Chicago Press and The American Society of Naturalists are collaborating with JSTOR to digitize, preserve and extend access to The American Naturalist. http://www.jstor.org THE AM ERICAN NATURALIST VOL. LXVII September-October,1933 No. 712 PROGRESSIVE CHANGE IN THE INSECT POPU- LATION OF FORESTS SINCE THE EARLY TERTIARY1 PROFESSOR CHARLES T. BRUES HARVARD UNIVERSITY ONE afternoonsome twentyyears ago during a winter sojourn in northernFlorida the writer was collectingin- sects in a pine forest given over to the production of turpelntine. Following the usual practice, the bark and sapwood of each tree had been cut away for a distance on one side and a pot hung at the bottomto catch the resin. The scarred trunks of the disfiguredtrees were reeking with oozing resin, and here and there insects of various kinds were imbeddedwhere theyhad been trapped by the sticky exudation.