vi CONTENTS 



CHAPTER IV 



Nutrition (continued) Manipulation of food Powers of diges- 

 tion, differing in different groups The formation of pellets 

 or castings Difference in the food of old and young in some 

 cases Different methods of feeding the young Young assist- 

 ing parents in feeding their juniors Feeding of each other 

 by the sexes Drinking, and eating of such substances as salt 

 and earth ..... . pp. 77-112 



CHAPTER V 



Propagation Care of young Different types of young birds 

 Different modes of feather-development, as seen in young 

 Fowl, Pigeon, or Duck, for instance Egg-coloration and its 

 meaning and variations Prolificacy and otherwise Incuba- 

 tion mounds Periods of incubation . . pp. 113165 



CHAPTER VI 



Propagation (continued) Nest-making not purely a bird-habit 

 Eggs laid without nests Types of nests Parasitic nesting 

 Parasitic layers, like Cuckoos and Cow-birds Degrees of 

 development of parasitic instinct . . . pp. 166-205 



CHAPTER VII 



Migration An anciently observed phenomenon still imperfectly 

 understood Reasons for it Methods as far as is known 

 Difference between migratory species and the homing Pigeon 

 Widespread tendency toj migration, contrasted with con- 

 tradictory tendency to form localized non-migratory races, 

 ending in some cases in Sightlessness, as in some birds of 

 remote islands . . . . . . pp. 206-224 



