List of Illustrations 



PAGE 



Head-piece (White Cypripedium). 157 



Tail-piece (Landscape). 166 



Head-piece (Flowers Welcoming Butterfly). 167 



Tail-piece (Dicentra). 169 



Figures s/iow/ng principally the Structure and Method of 

 Pollination of the 7>arious Flowers 

 An abstract Flower. 3 

 Figures showing historical progression in the discoveries relat- 

 ing to Flower fertilization. 4 

 Figure illustrating Grew's idea of how Flowers were fertilized. 5 

 Figure showing condition where self-fertilization is impossible. 7 

 Figure showing mechanical method of preventing self-fertil- 

 ization. 10 

 Figure showing conditions necessitating insect intervention. 13 

 Stamens. 25 

 Varying Flower organs. 26 

 Figures illustrating method of fertilization in the Barberry. 40, 41 

 Varying Buds of the Primrose. 51. 

 Figure showing the "worm i' the bud" in the Primrose. 52 

 Figures showing two forms of Flowers produced by the Bluets. 61 

 Cross-section of Brown-Eyed Susan. 68 

 Figures showing Compositae method of fertilization. 69 

 Figure showing disposition of Stamens in the Laurel. 72 

 Figure showing action of Stamens during visit of a Bee. 73 

 Figures illustrating structure of Andromeda. 77 

 Figures showing methods of Wasp in visiting Figwort. 82, 83 

 Seed-Pod of the Figwort. 83 

 Figures showing structure and process of fertilization of the 



Sage. 93 

 Figures showing structure and method of fertilization of the 



Horse-Balm. 94 



Figures illustrating structure of the Milkweed. loi 



Figures illustrating structure of the Arum. no 



Figures illustrating method of fertilization of the Arum. in 



Figures illustrating method of fertilization of the Iris. 117 



Figures illustrating structure of the Blazing-Star. 120 



Figures illustrating structure of an Orchid. 126 



Figures showing columns of the Orchids. 127 



An Orchid Seed-Pod. 128 



xvii 



