1 6 Explanatory 



in every instance represents one inch in relation to the size of 

 the bird. The numerals which follow the scientific name of 

 the species represent the length of the bird from the tip of the 

 bill to the end of the tail when stretched out on the 

 taxidermist's table; but when it is considered that individuals 

 of the same species often differ considerably in length, and that 

 when die bird is in motion its spinal column is curved, thus 

 rendering it shorter, these figures will not be taken too seriously 

 as aids to field work. However, to the entirely unsophisticated, 

 they may serve to show that a Hummingbird is smaller than a 

 Great Blue Heron. 



The drawings were made from mounted models, which in 

 several instances were prepared especially for this purpose. 

 The photographs were made in the field by an expert. 



