. Practical botany. Botany. Fig. 117. Head of Pronuba moth. Magnified p, mass of pollen held in posi- tion by spinous appendages of the moth's head the moth runs to the top of the pistil, as shown in Fig. 116, uncoils the organs which hold the pollen mass, and ^vith her tongue tlirusts the pollen vigor- ously into the stigmatic opening for several seconds. As the stigma is usually pollinated after every depo- sition of an egg, in cases where ten or a dozen eggs are introduced mto a single pistil it is pollmated as many times. After the hatching of the eggs, each little grub that is pro- duced
. Practical botany. Botany. Fig. 117. Head of Pronuba moth. Magnified p, mass of pollen held in posi- tion by spinous appendages of the moth's head the moth runs to the top of the pistil, as shown in Fig. 116, uncoils the organs which hold the pollen mass, and ^vith her tongue tlirusts the pollen vigor- ously into the stigmatic opening for several seconds. As the stigma is usually pollinated after every depo- sition of an egg, in cases where ten or a dozen eggs are introduced mto a single pistil it is pollmated as many times. After the hatching of the eggs, each little grub that is pro- duced from them eats up the ovule in which it was depos- ited, leaving, however, many other ovules to mature into seeds. It then bores its way out through the capsule, drops to the earth, and makes a cocoon of siUc a few inches underground. It probably does not assume the form of the adult (winged) in- sect until near the next bloom- ing time of the yuccas. The relations of the yucca moth to the plant afford a most remarkable example of cooper- ation between a plant and one of the lower animals. Without pollination by the moth, yuccas produce no seeds, while, on the other hand, without yucca capsules and their contents the Iar\'3e hatched from the eggs of the moth would starve.^ 1 See Proceedings of the American Associaiion for the Advancement of Science, 1880, Vol. XXIX, paper entitled "Further Notes on the Pollination. Fig. 118. Pod of a tree yiacca p, perforations caused by escape of larva of yucca moth. Somewhat reduced. After Thirteenth Annual Report of Missouri Botanical Garden. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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