LIST OF ILLUSTRATIONS. 



Showy Tick^Trefoil {Desmodium Canadense) 



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 .... 



7, 8, and 9. Roots of carrot, frogbit, and radish 



10. Sundew ....... 



11. An Australian pitcher plant 



12. Insect-eating pitchers of the Malayan nepenthes 



13. Male and female flower of a sedge . 



14. Beginnings of sex in a pond weed 



15. Flower, with petals removed, showing stamens and 



pistil ....... 



16. Grains of pollen sending out pollen-tubes 



17. Flower of a shrubbeiy plant, Weigelia 



18. Pin-eyed primrose ..... 

 ig. 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. Alale and female flower of salad-burnet . 



28. Flowers of bur-reed ..... 



29. Flowers of hazel ..... 

 30 and 31. Howers 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. 38, 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 , 



