PREFACE TO THE FOURTH EDITION. x i x 



chein; and if he be not acquainted with them, I would rec- 

 ommend him to ignore them, and to form his own judg- 

 ment of this book. No fair-minded person who reads it 

 will dream that I, in writing it, had thought of acting other- 

 wise than justly and generously* toward my predecessors, 

 the last of whom, to the grief of all who knew him, has re* 

 cently passed away. 



John Tystdall. 

 Apriih 1874 



