LIST OF PLATES 



Guelder Rose {Viburnum Opulus) . . , Frontispiece 



PLATH 



1. The Wild Camomile at home . . . Facing page 2 



2. Camomile flower-head — Tiny tubular florets 



from the central mass of the Camomile 



E>aisy „ 6 



3. Foxglove and Ox-eye Daisy — Part of a ray- 



floret showing the one-sided development 



of the tube to produce the petal-like part . ,, 7 



4. Branch of Wild Camomile photographed at 



mid-day 14 



5. The same branch photographed at 6 p.m. . ,, 15 



6. Showing the development of the young seed- 



ling from the Sycamore " key " . . ,, 20 



7. Unfolding of the nurse-leaves — The first pair 



of true leaves appear ,,22 



8. The nurse-leaves then shrivel up — A flower 



bud opening ,,23 



9. Young branches developing from the buds . ,, 24 



10. The pendent stalk of flowers appears — Stigma- 



bearing flowers whose stamens develop later 



or npt at all ,, 25 



11. The flowers attract swarms of flies of many 



species — Wild bee feeding on the nectar of 



the flowers ,,26 



12. Stigma after having been visited by a fly, 



showing the pollen grains upon it — Show- 

 ing how the flowers slowly change into 

 Sycamore " keys " ,,27 



13. Hairs from body of a bee, showing pollen 



grains entangled ,,28 



14. The completed work at the end of August . ,, 29 



15. Common Arum 1, 32 



16. The first stages— The second leaf ... n 34 



xvii 



