BEITISH WAEBLEES 



Song, diminution of, Marsh Warbler, xxi, 37. 



» , after arrival of female, Eeed Warbler, xx. 41. 



during autumn, Blackcap, iv, 28, 29. 



during flight, Whitethroat, i, 8. 



incubation confined to early hours of the morning, Marsh 



Warbler, xxi, 49. 



period of sexual activity, Wood Warbler, xv, 8. 



, Garden Warbler, v, 6, 20. 



gradually decreases after arrival of female, Garden Warbler, v, 10. 



, Icterine Warbler, xviii, 3. 



, imitation of that of other species, Marsh Warbler, xxi, 32. 



influenced by climatic changes, Willow Warbler, xiv, 10. 



, intermittent, Willow Warbler, xiv, 28. 



, Lesser Whitethroat, ii, 16. 



, metallic, Marsh Warbler, xxi, 14. 



, modification of, Marsh Warbler, xxi, 61. 



of female Eeed Warbler, xx, 57, 58. 



of male previous to arrival of females, Savi's Warbler, xxvii, 4. 



, passionate utterance of, Garden Warbler, v, 7. 



peculiar to certain localities, xxi, 38. 



, power of incorporating, of other species, Marsh Warbler, xxi, 57 



, power of, influenced by weather, Blackcap, iv, 7. 



, range of, Blackcap, iv, 12. 



, , Garden Warbler, v, 20. 



, , Lesser Whitethroat, ii, 17, 18. 



, , Marsh Warbler, xxi, 56. 



, Savi's Warbler, xxvi, 5. 



, Sedge Warbler, xxiii, 11. 



, spasmodic after incubation, Eeed Warbler, xx, 58. 



, spontaneous outbursts of, Eeed Warbler, xx, 57. 



, time of duration of, Whitethroat, i, 22. 



, traditional, Blackcap, iv, 34. 



, variation of, Whitethroat, i, 22. 



, varying of, according to locality, Willow Warbler, xiv, 28. 



, Willow Warbler, xiv, 14. 



Songs, male possesses two, Wood Warbler, xv, 17. 



Sorthaette, iv, 1. 



Spasmodic excitement of Blackcaps, iv, 22. 



Specific differentiation, Marsh Warbler, xxi, 67. 



Spencer, re natural selection, xxi, 16. 



Sperber-Grasmucke , vi, 1. 



Spotvogel, xviii, 1. 



Sprinkhaan Rietzanger, xxv, 1. 



Standard of efficiency, Eeed Warbler, xx, 23, 27. 



Starling, imitative powers, xxi, 55. 



Starrsangaren, xxiv, 1. 



Stealing nesting material, Eooks, xx, 30. 



Sterpazzola, i, 1. 



Stout, Dr., on visceral sensations, Marsh Warbler, xxi, 11. 



Stout's " Manual of Psychology," Eeed Warbler, xx, 43. 



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