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BRITISH WARBLERS
has been kind enough to give me the benefit of his wide experience in the case of many species. I must especially thank Professor Lloyd Morgan, Mr. W. P. Pycraft and Mr. G. E. Lodge for many valuable criticisms and suggestions, Mr. E. W. Hopewell for his great care in revising the proof-sheets, and Mr. H. Grönvold for the infinite pains he has taken in carrying out my wishes.
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