Note 17 — ON THE UTILITY TO FLOWERS OF THEIR BEAUTY.
Reading edition
For the whole subject of these most curious flowers, see Mr. Darwin's book "On the Different Forms of Flowers;" Rev. G. Henslow, Tr. Linn. Society, "Botany," 2nd series, vol. i. p. 317; Mr. Bennett, Journal of Linn. Society, "Botany," xiii. p. 147, xvii. p. 269.