LIST OF ILLUSTRATIONS. xvii 



FIGDRE p^OE 



35. Flower of Veronica Chamcedrys, showing method of fertilisa- 



tion by insects, and degeneracy of anterior petal Ill 



36. Flower of Teucrium, to show effect of weight of insect with 



exposure of stamens ... .., ... ... ... * ... 117 



37. Diagrams of Narcissus cernuus, to show instability in the 



heterostylism and lengths of stamens ... ... ... 121 



38. Basal end of a Pear, to show cause of thickening in response 



to forces ... ... ... ... ... ... ... ... 124 



39. Diagram of a declinate bough, showing distribution of forces 125 

 40 a. A diagram of declinate stamens, to show distribution of forces 126 

 406. Flower of Lamiww aZ&Mm, to show distribution of forces ... 126 



41. Base of flower of Amaryllis, showing the honey -protector ... 134 



42. Adhesive epidermal cells of roots of Orchids ... ... ... 137 



43. Stipules of Imjiafiejis, showing nectariferous tissue ... ... 140 



44. Petals passing into nectariferous stamens of .4<ra(/eT!e ... 141 



45. Cells of hair of Tradescantia, showing the state of protoplasm 



before and after excitation by electricity ... ... ... 152 



46. Climbing peduncle of Uncaria, thickened after irritation by 



the support ... ... ... ... ... ... ... 156 



47. Flower of Genista tinctoria, before and after mechanical 



irritation ; the claws of the keel and wing petals being 



in unstable equi'librium ... ... ... ... ... 160 



48. Flowers of Lopezia in three stages, showing movements of the 



staminode and stamen ... ... ... ... ... 161 



49. Flower of Medicago sativa, before and after mechanical irrita- 



tion, the staminal tube being in unstable equilibrium . . . 162 



50. Transverse sections of conducting tissues of Fumaria, Ruhus, 



and of a Crucifer ... ... ... ... ... ... 164 



51. Diagram of emergence of the petaline stamens of Peganmn 



outside the sepaline ... ... ... ... ... ... 189 



52. Flower-bad, and same opened, of Sfellaria media, showing 



conditions of degeneracy and adaptations for self-fertili- 

 sation ... ... ... ... ... ... ... .,. 255 



53. Flower-bud, and essential organs of Epilobium montanum, 



showing positions for self -fertilisation ... ... ... 255 



54. Styles and stigmas of the two forms of Pansy, showing the 



conditions which (a) prevent and (6) secure self-ferti- 

 lisation, respectively ... ... ... ... ... ... 255 



