These separate but related essays owe their existence to a combined concern for the workings of text criticism and historical linguistics and for the history of scholarship in these fields. On earlier occasions I have
suggested certain views on the development of the so-called comparative method. Few things are more rewarding than to bring implicit preconceptions of the past and present out into the open, as I aimed to do then and as I aim
to do now. This time existing tradition is treated as a body - without, I hope, being seriously distorting - and one small portion of its working assumptions is examined. My thanks go to the colleagues and students with whom I
have had fruitful discussion, but especially to Zellig S. Harris, and to Henry Hiz who expended much more than just his excellent editorial care on these efforts. I only hope that I have learned as much from him as he has
patiently tried to teach me. Lloyd W. Daly has kindly read parts of an earlier version and has contri­ buted valuable suggestions.