I would like to thank the many people who have helped me. Ali Duncan suggested
that the first people I thank should be those who tracked down references
for me from the library—these were Ali Duncan, Ben Evans, Gavin Ballantyne,
and Aleta Graham. Ben Sheldon and Andy Gardner were also extremely
effi cient at e-mailing me PDFs that I was having trouble accessing. Owen Henderson
provided the organism drawings that hopefully keep things more interesting
and that were smoothly scanned by Joe Tobias.