PREFACE 



The senior author has been responsible for the preparation of Chapters 1 

 through 6, and the junior author for the remainder of the book. Each has 

 profited greatly from the rigorous criticisms and constructive suggestions of 

 the other, and both are content to be held jointly responsible for errors or 

 omissions in any part of the book. It is our hope that past users of the Curtis 

 and Guthrie texts will agree that .the innovations introduced in this new book 

 constitute improvements and add to its usefulness. 



Mary J. Guthrie 

 John M. Anderson 



Detroit, Michigan 

 Ithaca, New Tork 

 October 1957 



