Libraries constitute the lifeblood of scholarship, and I must begin by thanking the faculty and staff of the Cunningham Memorial Library at Indiana State University for their invaluable assistance. I am especially grateful to Dara Middleton, formerly of the Interlibrary Loan department, who assisted in tracking down a number of my more obscure sources. Graduate students Bruce Dickerson and George Stachokas proved themselves excellent bibliographers and research assistants. Librarian Lynn Joshi of the Hagley Museum and Library provided some excellent sources in the history of technology, including the loan of some rare books on tall chimney construction.
Dr. Henri Dee Grissino-Mayer of Valdosta State University helped me to better understand the more technical aspects of tree-ring dating. Anthropologist Dr. Winifred Creamer of Northern Illinois University graciously answered a number of questions about Anasazi culture in the Four Corners region. At my own university, climatologist Dr. John Oliver must at times have thought of himself as my coauthor, so many were the questions he answered with utmost patience and accuracy. The same can be said for my colleagues Dr. John Allen, Dr. George Baaken, Dr. Greg Bierly, Dr. William Dando, and Dr. Basil Gomez, outstanding scholars all. Needless to say, the responsibility for any errors, however unintentional, is entirely my own.
A special thank-you goes to Nancy Miller of Walker and Company for supplying my agent with four pages of photocopied material on the Nobel laureate Svante Arrhenius and