lv PREFACE. 
together, an Appendix on the structure of Birds and a series of 
25 Plates. A First Edition of Part I., without the Appendix 
and the Plates, appeared in 1905. The present Guide is 
practically a reprint (with a few verbal corrections) of that 
issue, with the addition of the Appendix and Plate XXYV. 
Plates I—X XIV. can be purchased separately (price ls. 6d.). 
The statements in the Preface to the First Edition are no 
longer completely in accordance with the method of labelling 
adopted in the Bird Gallery. 
SIDNEY F. HARMER, 
Director. 
British Musnum (Narurat History), 
Cromwell Road, 
London, S.W. 7. 
March, 1921. 
