Vlll CONTENTS. 



PAGE 



COMPARING FEET 93 



COMPARING BILLS ' . .99 



EYES AND CAMERAS ... 108 



THE IRIS OF BIRDS 112 



WHITE BLACKBIRDS AND OTHER FREAKS . . 115 



PART III. 

 PROBLEMS OF BIRD LIFE: 



Little Studies in Zoological Theory. 



THE BASIS OF CLASSIFICATION ........ 121 



THE DEGREES IN CLASSIFICATION ....... 126 



How BIRDS ARE NAMED . 128 



CONCERNING THE BIRD'S LATIN NAME . . . . . . 130 



A SUBSPECIES ........... 132 



THE THREE GREAT PROBLEMS OF BIRD LIFE .... 135 



THE FIRST PROBLEM OF BIRD LIFE ...... 138 



THE SECOND PROBLEM OF BIRD LIFE ...... 142 



THE THIRD PROBLEM OF BIRD LIFE ...... 146 



PROTECTION BY COLOR ......... 149 



ZOOGEOGRAPHY ..... 155 



DISTRIBUTION 157 



MIGRATION 163 



PART IV. 

 SOME COMMON LAND-BIRDS: 



Little Studies in the Art of Observation. 



ABOUT BIRDS' DRINKING ......... 175 



How A HAWK EATS HIS FOOD . 179 



THE SMALL FLYCATCHERS 183 



