CONTEXTS %'ii 



PAGE 



57. Imbibition 44 



Experiment 8. Water of Imbibition. 45 



bS. Osmosis 45 



59. Osmosis in Root-bairs 46 



60. Influence of Soluble Salts 47 



Experiment 9. Demonstration of Osmosis 47 



Experiment 10. The Elffect of Soluble Salts 47 



61. Effect of Protoplasm upon the Absorprion of Soluble Salts 48 



62. Diffusion 4S 



Experiment 11. Diffusion in Liqmds and in Tissues 49 



63. Turgidity 49 



Experiment 12. Demonstration of Turgidity 50 



Traxspobt 



64. General Xature oC\ 



65. Types of Stem Structure 51 



66. Stem Structvue of an Herbaceous Dicotyledon 52 



67. Stems of Monocotyledons 53 



6S. Structure of Woody Stems 53 



69. Functions of the Stem 54 



Experiment 13. Structure of Stems 54 



70. The Upward Movement of the Water 54 



71. Causes of the Movement 55 



Experiment 14- Pathway and Rate of Movement 56 



Tkaxspiratiox 



72. The Structure of a Representative Leaf 56 



73. The ChlorenchjTn 57 



74. The Reduced Bundles 58 



Experiment 15. Structtire of a Leaf 58 



75. Diffusion in the Leaf 58 



76. Transpiring Surface 59 



Experiment 16. Meastirenient of the Actual Transpiring Surface. 59 



77. Structure and Position of Stomata 60 



7S. The Fimctions of Stomata 61 



79. Movements of Guard-cells 61 



Experiment 1 7. Movement of Guard-cells 62 



Experiment 18. Position of Stomata and Water Loss 62 



80. The Influence of Physical Factors upon Transpiration 63 



81. The Measurement of Transpiration 64 



82. Measiu-ing Transpiration in the Field 65 



Experiment 19. Influence of Factors upon the Rate of Transpira- 

 tion 65 



S3. The .\moimt of Transpiration in Plants 66 



84. Relation between Transpiration and Absorption 



S5. Compensation for Increased Transpiration. 



i'"^ 



'.V 



