. . . . . . 12
8. Runners establish new colonies . . . . . . . . . . . . . . . 13
9. Branches lean over and root in the soil . . . . . . . . . . 14
10. Living branches snap off and are carried by water or wind . 15

CHAPTER IV.--WATER TRANSPORTATION OF PLANTS.

11. Some green buds and leaves float on water . . . . . . . . . 18
12. Fleshy buds drop off and sprout in the mud . . . . . . . . . 20
13. Seeds and fruits as boats and rafts . . . . . . . . . . . . 22
14. Bits of cork around the seeds prevent them from sinking . . 24
15. An air-tight sack buoys up seeds . . . . . . . . . . . . . . 25
16. Fruit of basswood as a sailboat, and a few others as
adapted to the water . . . . . . . . . . . . . . . . . . 27

CHAPTER V.--SEEDS TRANSPORTED BY WIND.

17. How pigweeds get about . . . . . . . . . . . . . . . . . . . 30
18. Tumbleweeds . . . . . . . . . . . . . . . . . . . . . . . . 31
19. Thin, dry pods, twisted and bent, drift on the snow . . . . 35
20. Seeds found in melting snowdrifts . . . . . . . . . . . . . 36
21. Nuts of the basswood carried on the snow . . . . . . . . . . 37
22. Buttonwood balls . . . . . . . . . . . . . . . . . . . . . . 39
23. Seeds that tempt the wind by spreading their sails . . . . . 40
24. Why are some seeds so small? . . . . . . . . . . . . . . . . 42
25. Seeds with parachutes . . . . . . . . . . . . . . . . . . . 43
26. A study of the dandelion . . . . . . . . . . . . . . . . . . 44
27. How the lily sows its seeds . . . . . . . . . . . . . . . . 46
28. Large pods with small seeds to escape from small holes . . . 47
29. Seeds kept dry by an umbrella growing over them . . . . . . 48
30. Shot off by wind or animal . . . . . . . . . . . . . . . . . 50
31. Seed-like fruits moved about by twisting awns . . . . . . . 51
32. Grains that bore into sheep or dogs or the sand . . . . . . 51
33. Winged fruits and seeds fall with a whirl . . . . . . . . . 52
34. Plants which preserve a portion of their seeds for an
emergency . . . . . . . . . . . . . . . . . . . . . . . . 54

CHAPTER VI.--PLANTS THAT SHOOT OFF THEIR SPORES OR SEEDS.

35. Dry pods twist as they split open and throw the seeds . . . 57
36. A seed case that tears itself from its moorings . . . . . . 59

CHAPTER VII.--PLANTS THAT ARE CARRIED BY ANIMALS.

37. Squirrels leave nuts in queer places and plant some of them 61
38. Birds scatter nuts . . . . . . . . . . . . . . . . . . . . . 63
39. Do