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The Cone-flower 137 Cone-flower, Showing Numerous Florets, Some in Pollen, Others in Stigmatic Stage 139 Cross-fertilization of Cone-flower 140 The Fertilization of the English Arum, 1st Stage 141 The Fertilization of the English Arum. 2d, 3d, 4th, and 5th Stages 142 Pogonia 145 Cross-fertilization 146 A Pine Branch 151 Initial 151 The Picnic 159 Tail-piece 167 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Flower and Column of Orchis Spectabilis, Enlarged 195 Orchis Spectabilis 195 Position of Pollen of Orchis Spectabilis Withdrawn on Pencil 197 The Cross-fertilization of Orchis Spectabilis 197 The Purple-fringed Orchid 199 The Ragged Orchid (Front Section) 200 The Ragged Orchid (Profile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