INTRODUCTION 35 



watch long and closely, and who may still clear away some of 

 the difficulties. An attempt has been made in Our Feathered 

 Immigrants to deal with the subject on a comprehensive scale. 

 The publication was issued by the Agricultural Department, 

 which gave the author much assistance in collecting the material. 

 All the naturalised English birds are dealt with in the 

 publication. A list of dates on which introduced birds were 

 liberated or appeared in different districts of New Zealand, is 

 published in the Transactions of the New Zealand Institute, Vol. 

 xxxix. (1906), p. 503. 



