LIST OF ILLUSTRATIONS. 



Hedge Bindweed {Convolvulus sepium) 



Frontispiece 



1. A thin slice from a leaf, seen under the microscope 



2. Finger-veined leaves .... 



3. Feather-veined leaves .... 

 4 and 5. Types of lobed and divided leaves . 

 6. Parallel-veined leaves .... 



8, and 9. Roots of carrot, frogbit, and radish 

 Sundew ....... 



An Australian pitcher plant 



Insect-eating pitchers of the Malayan nepenthes 



Male and female flower of a sedge . 



Beginnings of sex in a pond weed 



Flower, with petals removed, showing stamens and 



pistil 



i6. Grains of pollen sending out pollen-tubes 



17. Flower of a shrubbery plant, Weigelia 



18. Pin-eyed primrose ..... 



19. Thrum-eyed primrose .... 



20. Male and female flowers of arrowhead 



21. Flower of water-plantain .... 



22. Flower of orchid ..... 



23. Pollen-masses of orchid .... 



24. The two pollen-masses, very much enlarged 



25. The common arum, or cuckoo-pint . 



26. Spike of the cuckoo-pint .... 



27. Male and female flower of salad-burnet . 



28. Flowers of bur-feed 



29. Flowers of hazel 



30 and 31. Flowers of wheat .... 

 32. Clusters of flowers ..... 

 33 and 34. Florets from the centre of a daisy . 



35. Floret from the ray of a daisy . 



36. Flower-head of a thistle .... 



37. 33, 39, 40, and 41. Forms of fruits . 

 42, 43, 44, and 45. Floating fruits . 

 46, 47, and 48. Adhesive fruits 

 49. First steps in the evolution of the stem 



