LIST OF PLATES 



PLATE 



17. A third leaf and the curious central object— 



The central object has become important Facing page 35 



18. The fully-developed Arum .... ,,36 



19. Midge-fly— Chamber where the midge-flies 



are entrapped ...••• ..37 



20. Showing the minute pollen grains adhering to 



the wings— The decline of the inflorescence ,, 42 



21. Bursting from it is a cluster of plump green 



berries — The scarlet berries ... ..43 



22. Pollen grains from Hazel catkins (immensely 



magnified) ...•••• ..5^ 



23. Male and female catkins of the Hazel or Nut 



Tree — Female catkin magnified to show 



pollen grains on its stigmas . . . ., 5^ 



24. The catkins appear in the autumn together 



with the nuts— Pollen tubes of Evening 



Primrose penetrating the stigma . . ,, 53 



25. Alder catkins— Flowers of the Ash Tree . .,54 



26. Flower of the Ash— Elm flowers ... ..55 



27. Leafy, winged seeds of the Elm— Winged 



seeds or " keys " of the Ash ... .. 5^ 



28. The Sensitive Plant when circumstances are 



favourable ; but if you breathe upon it ,, 57 



29. It immediately closes its leaflets . . ,, 60 



30. Lets fall its leaf stalks, and a second later ,, 61 



31. Presents this appearance .... ,,62 



32. Species of Oxalis with leaves in sleeping 



attitude .,63 



33. Tip of the young root of Barley showing its 



sensitive root-cap ,,66 



34. An Orchid whose sensitive roots leave the pot 



and feed upon the atmosphere ... ,,67 



35. Sensitive tendrils of the Bryony plant seeking 



for a friendly grip — Barberry flowers with 

 sensitive stamens. In next Fig, they are 

 seen to have ,,68 



36. Closed down on the ovary or central part of 



the flower— Showing how tightly the 

 stamens can grip an insect. Two stamens 

 are holding a large pin .... ,1 69 



xvill 



