_Habenaria Orbiculata_ 171 _Arethusa Bulbosa_ 177 _The Botanical Distribution of an Ordinary Flower and of the Orchid_ 182 _The "Column" in Various Orchids_ 183 _The Result of the Bee's Visit_ 184 _Cross-fertilization of Arethusa_ 188 _Habenaria Orbiculata. A Single Flower Enlarged_ 190 _Orchis Spectabilis_ 191 _Cross-fertilization of H. Orbiculata (Sphinx-moth)_ 193 _The Flower and Column of Orchis Spectabilis, Enlarged_ 195 _Orchis Spectabilis_ 195 _Position of Pollen of Orchis Spectabilis Withdrawn on Pencil_ 197 _The Cross-fertilization of Orchis Spectabilis_ 197 _The Purple-fringed Orchid_ 199 _The Ragged Orchid (Front Section)_ 200 _The Ragged Orchid (Profile Section)_ 202 _The Ragged Orchid (H. Lacera) and the Butterfly's Tongue. Cross-fertilization_ 203 _The Yellow Orchid (H. Flava)_ 204 _The Ragged Orchid (H. Lacera)_ 205 _Cypripedium Acaule_ 207 _Moccasin-flower (C. Acaule)_ 208 _The Bee Imprisoned in the Lips of Cypripedium_ 210 _Moccasin-flower. Bee Sipping Nectar_ 211 _The Bee Passing Beneath the Stigma_ 213 _A Bee Receiving Pollen-plaster on His Thorax_ 214 _Rattlesnake-Plantain--the Young and the Old_ 215 _Cross-fertilization of the Rattlesnake-Plantain. Side Sections_ 216 _Cross-fertilisation of the Rattlesnake-Plantain. Front View_ 217 _The Tongue of a Bumblebee_ 218 _Goodyera, or Periamium Pubescens_ 221 _Milkweed Captives_ 231 _The Pollen Masses and the Fissure_ 232 _The Tragedy of the Bees_ 235 _A Moth Caught by the Tongue in Dogbane_ 237 _A FAMILIAR GUEST_ [Illustration]