ABSTRACT
I am grateful to the Graduate School Office of Research and Projects of Southern Dlinois University, Carbondale, for a grant which made possible the research for this paper. I should also like to thank Mr Alan Cohn and Miss Kathleen Eads of Morris Library at S.I.U. for their constant help in procuring books for my research through purchase or interlibrary loans. Finally, a special word of thanks is due Dr Stephen Victor of Simon Fraser University for several bibliographical leads and to Prof. John Hoag of the University of Colorado and Prof. Harold McFarlin of S.I.U. for their critiques of the paper while it was in draft form.
