CONTENTS 
r AGK 
Preface v 
List of Illustrations xi 
List of Scientific Names xiii 
CHAPTER 
I. Introductory i 
The Cuckoo— Main facts— Dr. Eugene Rey’s investigations— 
Other students of the problem. 
II. The First Season (1918) : Record of Observations 14 
Cuckoo A’s eleven eggs — Cuckoo B— Puzzles and probable 
solutions — Summary. 
III. The Second Season (1919) 24 
Initiation of system— Cuckoo A’s return— Her eighteen eggs — 
Summary. 
IV. The Third Season (1920) : Preliminary Notes . . 33 
Organisation — “Restarting” — Nidification time-table of the 
fosterers. 
V. The Third Season (1920) : Record of Observations 51 
Cuckoos A and B — Cuckoo A’s first ten eggs— Eleventh to - 
twenty-first eggs — The first thrill — Witnesses and evidence. 
VI. The Third Season (1920) : Notes . . . .100 
Habits of Cuckoo before and during laying— Watching fos- 
terers’ nest— Agitation of fosterers — Summary of Cuckoo A’s 
record egg-laying. 
VII. The Fourth Season (1921) : The Fosterers’ History 108 
Six pairs of Meadow Pipits nesting— Details of their nest. 
VIII. The Fourth Season (1921) : Record of Observations 112 
The “ hides ” — Preliminary work — Return of Cuckoo A — First 
attempts at cinematography — Success — Fifteen eggs— Many 
witnesses and much filming — Summary of season. 
IX 
