Moths and Butterflies of the United States, East of the Rocky Mountains e-bog

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The hard and fast lines fixed by naturalists do not really exist in Nature. As daylight blends into darkness and night again into day, or as the colors of the rainbow softly shade into one another, the violet into the blue, and the blue into the green, etc., so the different groups of insects pass by almost insensible gradations one into another.