. The origin of floral structures : through insect and other agencies. Plants; Flowers; Flowers. PROGRESSIVE METAMORPHOSES. 287 stiTOulns required to bring the extra flow to the bracts, etc., being presumably the irritation induced by insect visitors. The next progressive state is for bracts to assume a more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Henslow, George, 1835-1925. New York : Appleton

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Keywords: ., bookcentury1800, bookdecad, booksubjectflowers, booksubjectplants