LIST OF ILLUSTRATIONS 



1. Protococcus plants . ' . 



2. Spirogyra filament 



3. Apple leaf in section, showing cells 



4. Germination of beans, showing need of oxygen 



5. Germination of rice, showing need of oxygen 



6. Seed-tester 



7. Germinating pumpkin seed 



8. Plantlet of pumpkin 



9. Plantlet of Indian corn . 



10. Plantlet of bean 



11. Plantlet of pea 



12. Bean plantlets which have lost their cotyledons 



13. Radishes grown from heavy and light seed (Bailey) 



14. Cross-section of germinating Indian corn grain (Frank) 



15. Cross-section of leaf of beech (Strasburger) . 



16. Starch in potato cell ....... 



17. Section of apple leaf 



18. Stomata on leaf of garden beet (Frank and Tschirch) 



19. Stomata on apple leaf 



20. Prosenchyma cells from stem of rye (Frank and Tschirch) 



21. Cross-section of vascular bundle of sunflower (Prantl) 



22. Transverse section of comer of bean stem (Potter) 



23. Live poplar tree with hollow trunk 



24. Healing of wound formed by cutting off a branch 



25. Callus at base of willow cutting 



26. Dwarfing of crop hy a spruce hedge 



27. Slips of Tradesoantia 



28. Roots of wheat plant, showing root-hairs (Frank and 



Tschirch) . . . 



29. Turnip seedling, showing root-hairs (Frank and Tschirch) . 



30. Root-hair magnified with adhering particles of soil (Sachs) . 



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