X 
CONTENTS . 
CHAPTER 
PAGE 
XVII. . . 
Building Birds— continued .... 
193 
XVIII. . . 
Building Insects 
207 
XIX. . . 
Sub-Aquatic Nests ( Vertebrates ) . 
22 5 
XX. . . 
Sub-Aquatic Nests ( Invertebrates ) 
228 
XXI. . . 
Social Habitations 
245 
XXII. . . 
Social Birds 
251 
XXIII. . . 
Social Insects . . . 
256 
XXIV. . . 
Social Insects— continued .... 
273 
XXV. . . 
Parasitic Nests ...... 
287 
XXVI. . . 
Parasitic Nests— concluded .... 
309 
XXVII. . . 
Branch-Building Mammalia 
320 
XXVIII. . . 
Feathered Branch-Builders 
323 
XXIX. . . 
Feathered Branch-Builders — concluded . 
344 
XXX. . . 
Branch-Builders (. Spiders and Insects ) 
360 
XXXI. . . 
Miscellanea 
379 
INDEX 
4 
407 
