Vlll PREFACE. 



present one, though that of all was not available. Those 

 who have co-operated in the revision include Dr. Bernard 

 Dyer, Mr. A. T. Matthews, Professor J. Prince Sheldon, 

 Mr. Sanders Spencer, Mr. Edward Brown, and Mr. A. H. 

 Archer, M.R.C.V.S., to all of whom grateful acknowledg- 

 ment is made. Mr. James Sinclair also is thanked for valuable 



information and advice. 



W. E. B. 



1908. 



