Bibliographical noteFunding Information:
* The preparation of this paper was supported by a grant from the Ford Foundation to the University of New Mexico. Given the scattered sources on which it had to be based, I am more than usually indebted for a great deal of assistance from others. First, I thank my graduate research assistants, John Read, Joanna Green and Kathryn Manue-lito, who found facts, checked guesses and argued conclusions through all stages of preparing the paper. Second, I am grateful to those associated with programs who provided information; in particular I thank Robert Rebert, Harry Berendzen, Michael Krauss and Elaine Ramos. Third, I thank all who read the manuscript in one of its earlier versions, and suggested (or insisted on) corrections in fact or interpretation.Of these, I mention in particular Harry Berendzen. Finally, I must mention the technical skills of Judy Benedetti and Maia Cramer that turned scribbled drafts and messy handwritten additions into a final legible version.