LIST OF ILLUSTRATIONS 



Elms at the Water's Brink Frontispiece 



FIGURE PAGE 



1. Simple Osmometer 3 



2. Plant Cell 4 



3. Animal Cell 4 



4. Tissue ............ 5 



5. Diagram : Showing proportion of chemical elements in living 



things 8 



6. Female Grasshopper 11 



7. Diagram : Showing main parts of the grasshopper ... 13 



8. Mouth Parts of the Grasshopper . . . . . . .14 



9. Grasshopper Laying Eggs . . . . . . . .15 



10. Incomplete Metamorphosis of the Tree Cricket .... 17 



11. Codling Moth Larva 17 



12. The Worm in the Apple 18 



13. Codling Moth Pupa . 18 



14. Codling Moth 19 



15. Monarch Butterfly 20 



16. Modern Spraying Outfit 21 



17. Plant Lice on Fern 24 



18. Mealy Bug 25 



19. Cicada, Adult and Nymph 25 



20. May Beetle 26 



21. Eggs of Ladybug ........ 26 



22. Holes Made by Woodpeckers ...... 27 



23. Redheaded Woodpecker 28 



24. Larva of Mourning Cloak Moth 28 



25. Transformation of Pupa of Mourning Cloak Moth into Adult . 29 



26. Cecropia Moth 30 



27. Young Tobacco Worm . ... 30 



28. Larvae of a Leaf Miner • • .31 



29. Cedar Bird 



30. A Geometrid Moth ..... . .32 



31. Protective Coloration 33 



32. Yellow Swallowtail . 33 



ix 



