| Page |
| William Hamilton Gibson | Frontispiece |
| Initial. The Studio Door | 3 |
| The Rose-bush Episode | 9 |
| A Corner of My Table | 12 |
| An Animated Brush | 14 |
| A Specimen in Three Stages | 16 |
| The Studio Table | 18 |
| Initial | 23 |
| The European Cuckoo | 24 |
| The Yellow-billed Cuckoo | 26 |
| Browsing Kine | 29 |
| A Greedy Foster-child | 34 |
| The Yellow Warbler | 44 |
| A Blighted Home | 46 |
| The Normal Nest of the Yellow Warbler | 47 |
| The Yellow Warbler at Home | 49 |
| A Suspicious Nest of the Yellow Warbler | 50 |
| The Nest Separated | 52 |
| Initial | 57 |
| The Door-step Arena, with its Pitfalls | 60 |
| Fishing for Tigers | 65 |
| Tiger-beetle | 68 |
| The Spider Victim | 70 |
| Filling the Spider's Grave | 71 |
| Black Digger-wasp | 73 |
| Black Digger-wasp and His Victim, Showing the Egg of the Wasp Attached | 75 |
| Protecting the Burrow while Searching for Prey | 79 |
| The "Cow-spit" Mystery Disclosed | 81 |
| The Tiger's Head, from the Victim's Stand-point | 84 |
| Initial. Branch of the Bittersweet | 87 |
| A Bittersweet Covey | 90 |
| Flushing the Game | 92 |
| Specimen Twig | 94 |
| Building Froth-tent | 100 |
| Butterflies and Flowers | 105 |
| A Row of Stamens | 106 |
| The Parts of a Flower | 109 |
| Historical Series, Showing the Progress of Discovery of Flower Fertilization | 110 |
| The Garden Sage | 120 |
| Cross-fertilization of the Sage | 121 |
| Elastic Stamens. Anthers Inserted in their Pockets | 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 | 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 |
