ILLUSTRATIONS. 



IX 



Page 



Concealment of Honey in Flowers, - - - 181 

 Examples of Colour-contrasts in Flowers, - - 184 

 Two New Zealand Haastias or" Vegetable Sheep" 



(Haastia pulvinaris and Sinclairii), - - 188 

 Colour-contrast in the flowers of the Bean ( Vicia 



Faba), - 189 

 Narcissus (Narcissus poeticus), showing colour- 

 contrast, 190 



Preparation of Flowers for Insect-visits in the 



Laburnum (Cytisus Laburnum), - - - 223 

 Arrangements for the reception of Insects at the 



entrance to the Flower, .... 226 

 Arrangements for the reception of Insects at the 



entrance to the Flower, .... 227 

 Wood Anemone (Anemone nemorosa), - - 229 

 American Dogwood (Cornus florida), ... 231 

 Sticky glands as a protection to Flowers, - - 236 

 Sticky Bristles at the edge of the Calyx as a pro- 

 tection to Flowers, 237 



Tufts of Hair as a Protection to Flowers, - - 240 

 Capitula of Serratula lycopifolia protected by Ants 



from the attacks of a Beetle, - - - 242 

 Contrivances for loading insects with pollen, - 246 

 Longitudinal section through a flower of the 



Evening Primrose ((Enothera biennis), 247 

 Contrivances for ensuring the deposition of pollen 



on insect- visitors, 249 



Withdrawal and deposition of pollinia in the 



flowers of an Orchid, 255 



Clip-mechanism for fastening the pollinia of As- 



clepias Cornuti to the feet of insects, - - 258 

 Apparatus for pumping pollen on to the bodies of 



insects, - 261 



Transference of pollen to the bodies of insects by 



means of mechanism of the percussive type, 262 

 Explosive apparatus for the transfer of pollen to 



the bodies of insects, ----- 265 

 Explosive apparatus in a papilionaceous flower, - 266 

 Transference of pollen to the bodies of insects by 



means of explosive apparatus, ... 267 

 Expulsive apparatus in Orchid-flowers : flower of 



Catasetum tridentatum, .... 269 

 Flower of Pedicularis recutita, - - - - 272 

 Sprinkling apparatus of various plants, - - 273 



Sprinkling apparatus, 275 



Arrangements for the Retention of the deposited 



Pollen, 279 



Deposition of the Pollen in Mimulus luteus, 280 

 Evening Primrose ((Enothera biennis), - 282 

 Calabar or Ordeal Bean (Physostigma venenosum), 285 

 Types of the 1st to 10th classes of the Linnean 



System, * - 289 



Types of the 13th, 14th, 15th, 16th, 18th, and 20th 



classes of the Linnean System, - - - 292 

 Types of the llth, 12th, 17th, and 21st classes of 



the Linnean System, 293 



Type of a monoecious plant: Common Oak 



(Quercus pedunculata), .... 298 



Page 

 Type of a dioecious plant : Crack Willow (Salix 



fragilis), 299 



Heterostyled flowers : Primrose and others, - 302 

 Change of Position of Anthers and Stigmas, - 305 

 Flower of the Rue (Ruta graveolens), - - - 306 

 Completely dichogamous Flowers (Geranium, 



Parietaria), 307 



Dichogamy in Saxifraga rotundifolia, - 308 

 Incompletely dichogamous Flowers (Epilobium, 



Eremurus), 309 



Geitonogamy with adherent pollen, ... 320 

 Greitonogamy with dust-like pollen, - - - 329 

 Autogamy effected by the inclination of curved 



stamens, 342 



Autogamy effected by inclination of curved 



stamens (Circcea, Agrimonia), - - 343 

 Autogamy brought about by elongation of the 



the pistil (Epimedium alpinum), - - - 349 

 Autogamy effected by means of an inflection of 



the style, - 351 



Autogamy in the flowers of the Willow-herb 



(Epilobium angustifolium), .... 354 

 Autogamy by means of spiral twistings of stamens 



and style, - - - 357 



A.utogamy by means of a crossing or a bending 



back of the style-branches, .... 360 

 Autogamy effected by means of an inflection of 



the style-branches (Arnica, Senecio), - - 363 

 Autogamy effected by the petals, - - - 369 

 Autogamy effected by means of the corolla (Gen- 



tiana asclepiadea), 372 



Autogamy effected by means of the corolla (Pedi- 

 cularis incarnata), 375 



Autogamy caused by inflection of the flower-stalk 



and the adjustment of the under-lip to form 



an inclined plane down which pollen slides 



to the stigma: Calceolaria Pavonii, - 380 

 Autogamy caused by the combined inflections of 



pedicel and stamen-filaments : Pyrola uniflora, 383 

 Autogamy through inflection of the pedicel and 



disarticulation of the corolla: Phygelius 



capensis, 384 



Autogamy resulting from an inflection of the 



pedicel accompanied by spiral torsion of the 



filaments: Cobcea scandcns, .... 385 

 Autogamy resulting from inflection of the pedicel 



combined with inclination of the style to the 



place where the pollen has been deposited: 



Attium Chamcemoly, 386 



Autogamy resulting from inflection of the pedicel 



combined with the folding up of the corolla : 



Gentiana Clusii, ------ 388 



Development of Pollen-tubes in LUium Martagon 



and Avena elatior, 409 



The course of the pollen-tubes in a Rock-rose 



(Helianthemum marifolium), - - - 411 

 Chalazogamic fertilization in the Hornbeam (Car- 



pinus Betulus), 412 



