INDEX 



Eggs, number of, Blackcap, iv, 21. 



in clutch, Marsh Warbler, xxi, 49. 

 period exposed according to climatic conditions, Blackcap, iv, 20. 

 time of laying, Whitethroat, i, 17. 



, Willow Warbler, xiv, 20, 25. 



■ , Wood Warbler, xv, 16. 



Wood Warbler, xv, 16. 

 Elimination of the weaker, xxi, 19. 



, Reed Warbler, xx, 26. 



, Willow Warbler, xiv, 8. 



, process of, Reed Warbler, xx, 22. 



Emotion, absence of, in regard to collapse of young, Whitethroat, i, 21. 



, burst of , Marsh Warbler, xxi, 35. 



• ■ due to sexual origin, xxi, 39. 



, expression of, Willow Warbler, xiv, 22. 



, human, Marsh Warbler, xxi, 6, 8. 



, mode of expressing, Marsh Warbler, xxi, 35. 



• •, relation of attitude to, xxi, 38, 39. 



, sexual, Garden Warbler, v, 12. 



, , Marsh Warbler, xxi, 30. 



Emotional behaviour (Summary), 8, 9. 



due to presence of another male, xxi, 39. 

 — , Marsh Warbler, xxi, 4, 9, 36, 55, 63. 



'similarity of Grasshopper Warbler to Savi's Warbler, xxi, 14. 

 — , Willow Warbler, xxi, 14; Chiff-chaff, xxi, 14; Lesser White- 

 throat, xxi, 14; Blackcap, xxi, 14; Garden Warbler, xxi, 14. 

 Wood Warbler, xv, 12, 16, 17. 



- development, Dartford Warbler, viii, 4. 



- expression, Savi's Warbler, xxvi, 4; Grasshopper Warbler, xxvi, 4; 

 Chiff-chaff, xxvi, 4; Willow Warbler, xxvi, 4; Reed Warbler, xxvi, 5; 

 Marsh Warbler, xxi, 65, xxvi, 5; Whitethroat, xxvi, 5; Lesser White- 

 throat, xxvi, 5. 



- life of young birds, Moorhen, xxi, 11. 



- manifestation (Summary), 8. 

 Garden Warbler, v, 8. 



— , Marsh Warbler, xxi, 5, 6, 7, 19. 

 periods, xxi, 12. 



manifestation of, Marsh Warbler, xxi, 65. 

 reaction, xxi, 18. 



Dartford Warbler, viii, 4, 6. 



- response, Garden Warbler, v, 9, 16. 



system, xxi, 38. 



, Marsh Warbler, xxi, 66; Reed Warbler, xxi, 66. 



Emulation, Blackcap, iv, 35. 

 Enemies of Lesser Whitethroat, ii, 11. 



Sedge Warbler, xxiii, 10. 



Willow Warbler, xiv, 7. 



Environment, xxi, 12, 19. 



, adaptation to, Marsh Warbler, xxi, 64. 



as regards late arrival, xxi, 25. 



