INTRODUCTION. 



very pleasing to the senior author to see the new school attacking the live 

 subject in so thorough a manner, and we hope that the present work will 

 assist such in the most complete manner. In this volume we give an 

 illustration of the subspecific characters of the Silver Gull, and we propose in 

 the succeeding volumes to illustrate further such features when of sufficient 

 import. 



GREGORY M. MATHEWS. 



TOM IREDALE. 



12th February, 1921. 



