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 sucji substances as salt 



^ and earth • • PP- 77~'^^^ 



t 



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. 1 13-165 



CHAPTER VI 



Propagation (««<»««*(£)— Nest-making not purely a bird-habit — 

 Eggs laid without nests — ^Xypes 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 to 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 



