In Memory of 

 David R. Evans 



Ccf ' 5 



OLIVER AND BOYD LTD. 



Tweeddale Court 

 Edinburgh i 



39A Wei beck Street 

 London W. i 



First published . . 1968 



© 1968, DeForest Mellon, Jr. 



05 ooi6z2 9 (Hardback) 

 05 001682 2 (Paperback) 



Printed in Great Britain by 

 T. and A. Constable Ltd., Edinburgh 



