11. A corn-plant ten days after planting the seed 19

12. To show where growth in length of the root takes place 22

13. Radish seeds sprouted on dark cloth 22

14. To show how water gets into the roots of plants 23

15. To show osmose 23

16. To show that roots need air 26

17. Comparison of fresh and boiled water 26

18. Comparison of moist sand and puddled clay 27

19. Comparing soils 32

20. Water-test of soils 33

21. To show what becomes of the water taken from the soil
by roots 40

22. Percolation experiment. To show the relative powers
of soils to take in water falling on the surface 41

23. Bottles used in place of the lamp chimneys in Figs.
22 and 24 44