124

_Elastic Stamens of Mountain-laurel_ 125

_Andromeda Ligustrina_ 127

_Fertilisation of Andromeda_ 128

_The Laurel_ 130

_Cross-fertilization of the Blue-flag_ 131

_Blue-flag_ 132

_Pogonia and Devil's-bit_ 133

_Devil's-bit_ 134

_Horse-balm. Collinsonia_ 135

_Cross-fertilization of the Horse-balm--Flowers in Various
Stages, and in the Order of their Visitation by the Bee_ 136

_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_