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for its daily food. There can be no doubt that a protective advantage of this sort, however 

 slight in itself, would have an appreciable effect on the survival of the fittest, and that, allowing 

 sufficient time for this modification of character to develop itself, the species would at length, 

 under certain conditions of existence, lose the black band altogether on the left-hand side. 



I do not propose to enter here into a discussion of the theory which a consideration of these 

 facts seems necessarily to involve ; but I see myself no difficulty whatever in reconciling this view 

 of the evolution of species by means of natural selection with a belief in the unity of design in 

 Creation, and with the acceptance of the great truths of revelation. 



