X PREFACE. 



PAGE 



164: Illustration of variability from Mr. Baker's re- 

 vision of the British Roses. 



173 Additional facts, on local variations of colour. 



15^6 Additional genus of birds (Ceycopsis) peculiar 

 to Celebes. 



199, 200. Concluding remarks. 



Nl.The Philosophy of Birds' Nests. 



218 On nesting of Terns and Gulls, rewritten. 

 220 to 222. Daines Barrington, and others, on the song 

 of birds. 



223 On young birds learning to build, by memory and 



imitation. 



224 Levaillant, on mode of nest-building. 

 229 On imperfect adaptation in birds' nests. 



V1L A Theory of Birds' Nests. 



231, 232. Introductory passages modified, with some 

 omissions. 



233 How modifications of organization would affect the 

 form of the nest. 



235 Illustration from the habits of children and savages. 



235, 236. Objection t term " hereditary habit " 

 answered. 



237 Passage rewritten, on more or less variable char- 

 acters in relation to nidification. 



248 On males choosing or rejecting females, and on 

 the various modes in which colour may be 

 acquired by female birds. 



