Field Museum 

 of Natural History 

 Bulletin 



Published by 



Field Museum of Natural History 



Founded 1893 



President: Willard L. Boyd 



Editor! Designer: David M. Walsten 

 Production Liaison: Pamela Steams 

 Staff Photographer: Ron Testa 



Board of Trustees 



Richard M. Jones, 



Chairman 

 Mrs. T. Stanion Armour 

 George R. Baker 

 Robert O. Bass 

 Gordon Bent 

 Mrs. Philip D. Block UI 

 Willard L. Boyd 

 Robert D. Cadieux 

 Henry T. Chandler 

 Worley H. Clark 

 Frank W. Considine 

 Stanton R. Cook 

 William R. Dickinson, Jr. 

 Thomas E. Donnelley II 

 Thomas J. Eyerman 

 Marshall Field 

 Ronald J. Gidwitz 

 Clarence E. Johnson 

 John James Kinsella 

 Hugo J. Melvoin 

 Leo F. Mullin 

 Earl L. Neal 

 James J. O'Connor 

 Robert A. Pritzker 

 James H. Ransom 

 John S. Runnells 

 Patrick G. Ryan 

 William L. Searle 

 Mrs. Malcolm N. Smith 

 Robert H. Strotz 

 Mrs. Theodore D. Tieken 

 E. Leland Webber 

 Blaine J. Yarrington 



Life Trustees 



Harry O. Bercher 

 Bowen Blair 

 Mrs. Edwin J. DeCosta 

 Clifford C.Gregg 

 William V. Kahler 

 William H. Mitchell 

 Edward Byron Smith 

 John W. Sullivan 

 J. Howard Wood 



CONTENTS 



September 1986 

 Volume 57, Number 8 



September Events at Field Museum 



Discovering Chicago's Dialects 



by Michael I. Miller 



A Sylvan Retreat: Chicago's Wooded Island 12 



by Jerry Sullivan 



Millipede Hording 24 



by Joseph Hannibal and Cassandra Talerko 



Field Museum Tours 



26 



COVER 



Indiana Dunes State Park, little more than an hour from 

 Chicago 's Loop by train, is a superb hiking area for natu- 

 ralists. Lush deciduous and evergreen forests, bogs, dune- 

 land, and a breathtaking sweep of sandy beach are to be 

 found in this well-maintained park along Lake Michigan 's 

 southern tip. Photo by Dave Walsten. 



Field Museum offers three different environmental field 

 trips this fall to the Indiana Dunes. Check your Fall Field 

 Trip brochure for trip descriptions and dates, or call (312) 

 322-8855 for more information. 



Volunteer Opportunity 



Do you find fossils fascinating? Are you interested in 

 invertebrates? Or is plant care more pleasing? If you 

 can give one day a week for a year, you can expand your 

 knowledge and share your skills as a volunteer in one of 

 Field Museum's "behind-the-scenes" departments. 

 Are you more of a "people" person? Our Education 

 volunteers help schoolchildren and the general public 

 learn about natural history through tours and pro- 

 grams. Weekend Education volunteers give two 

 weekend days per month. For more information, 

 please contact Ellen Zebrun, Volunteer Coordinator, 

 at (312) 922-9410, extension 360. 



Field Museum of Natural History Bulletin (USPS 898-940) is published monthly, except combined July/August issue, by Field Museum of Natural History, Roosevelt Road at Lake Shore Drive. 

 Chicago, IL 60605-2496 © 1986 Field Museum of Natural History. Subscriptions: $6.00 annually. $3.00 for schools. Museum membership includes Bulletin subscription. Opinions expressed by 

 authors are their own and do not necessarily reflect the policy of Field Museum. Unsolicited manuscripts are welcome. Museum phone: (312) 922-9410. Notification of address change should 

 include address label and be >ent to Membership Department. Postmaster: Please send form 3579 to Field Museum of Natural History, Roosevelt Road at Lake Shore Drive, Chicago, IL 60605-2496. 

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