Founding Editor-in-Chief: Sandra Lach Arlinghaus, University of Michigan; Institute of Mathematical Geography (independent) Editorial Advisory Board: Geography. Michael F. Goodchild, University of California, Santa Barbara Daniel A. Griffith, Syracuse University Jonathan D. Mayer, University of Washington (also School of Medicine) John D. Nystuen, University of Michigan Mathematics. William C. Arlinghaus, Lawrence Technological University Neal Brand, University of North Texas Kenneth H. Rosen, A. T. & T. Bell Laboratories Engineering Applications. William D. Drake, University of Michigan Education. Frederick L. Goodman, University of Michigan Business. Robert F. Austin, Austin Communications Education Services. Technical Editor: Richard Wallace, University of Michigan. Web Design: Sandra L. Arlinghaus William E. Arlinghaus.

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MISSION STATEMENT The purpose of Solstice is to promote interaction between geography and mathematics. Articles in which elements of one discipline are used to shed light on the other are particularly sought. Also welcome are original contributions that are purely geographical or purely mathematical. These may be prefaced (by editor or author) with commentary suggesting directions that might lead toward the desired interactions. Individuals wishing to submit articles or other material should contact an editor, or send e-mail directly to

SOLSTICE ARCHIVES Back issues of Solstice are available on the WebSite of the Institute of Mathematical Geography, and on the GOPHER of the Arizona State University Department of Mathematics. Thanks to Bruce Long for taking the initiative in this matter. The connections to this GOPHER are available along a variety of routes through the Internet.

PUBLICATION INFORMATION The electronic files are issued yearly as copyrighted hardcopy in the Monograph Series of the Institute of Mathematical Geography. This material will appear in Volume 21 in that series, ISBN to be announced. To order hardcopy, and to obtain current price lists, write to the Editor-in-Chief of Solstice at 2790 Briarcliff, Ann Arbor, MI 48105, or call 313-761-1231. Suggested form for citation: cite the hardcopy. To cite the electronic copy, note the exact time of transmission from Ann Arbor, and cite all the transmission matter as facts of publication. Any copy that does not superimpose precisely upon the original as transmitted from Ann Arbor should be presumed to be an altered, bogus copy of Solstice.