CONTENTS.
Introduction Pages 1–5
OPHREÆ.
Structure of the flower of Orchis mascula—Power of movement of the pollinia—Perfect adaptation of the parts in Orchis pyramidalis—Other species of Orchis and of some closely allied genera—On the insects which visit the several species, and on the frequency of their visits—On the fertility and sterility of various Orchids—On the secretion of nectar, and on insects being purposely delayed in obtaining it
6–44
OPHREÆ—continued.
Fly and Spider Ophrys—Bee Ophrys, apparently adapted for perpetual self-fertilisation, but with paradoxical contrivances for intercrossing—Herminium monorchis, attachment of the pollinia to the front legs of insects—Peristylus viridis, fertilisation indirectly effected by nectar secreted from three parts of the labellum—Gymnadenia conopsea, and other species—Habenaria or Platanthera chlorantha and bifolia, their pollinia attached to the eyes of Lepidoptera—Other species of Habenaria—Bonatea—Disa—Summary on the powers of movement in the pollinia
45–79
