preface. 
XI 
only to be expected that the close study involved in the 
preparation of the “ Catalogue of Birds ” would result in the 
discovery of new genera, but there is a sure test as regards 
the calibre of our work in store for Canon Tristram, for 
myself, and for every other writer. Future generations will 
judge the value of our labours, and that which is good will 
he preserved, and that which is bad will be cast into outer 
darkness. 
I have to thank Mr. Howard Saunders, Mr. W. E. de 
Winton, and Mr. Robert Read for assisting me with notes for 
the present volume, and special acknowledgments are due to 
Count Salvador! for the notes he has given me on the Ducks 
nnd Geese. 
R. BOWDLER SHARPE. 
