X CONTENTS. 



CHAPTER III. 



ABSORPTION OF LIQUID NUTRIMENT. 



Formula for solution of nutrient materials, 46. Plants take 

 liquid food from the soil, 50. How food solutions are car- 

 ried into the plant, 51. How the root-hairs get the watery 

 solutions from the soil, 52. Plants cannot remove all the 

 moisture from the soil, 53. Acidity of root-hairs, 56. . .page 22 



CHAPTER IV. 



TURGESCENCE. 



Turgidity of plant parts, 58. Restoration of turgidity in shoots, 

 59. Tissue tensions, 61. Longitudinal tissue tension, 62. 

 Transverse tissue tension, 65 page 28 



CHAPTER V. 



ROOT PRESSURE. 



Root pressure may be measured, 67. Experiment to demon- 

 strate root pressure, 68 page 31 



CHAPTER VI. 



, TRANS PI RATION. 



Loss of water from excised leaves, 71. Loss of water from 

 growing plants, 72. Water escapes trom the surfaces of 

 living leaves in the form of water vapor, 73. Experiment 

 to compare loss of water in a dry and a humid atmosphere, 

 74. The loss of water is greater in a dry than in a humid 

 atmosphere, 75. How transpiration takes place, 76. Struc- 

 ture of a leaf, 79. Epidermis of the leaf, 80. Soft tissue 

 of the leaf, 81. Stomata, 82. The living protoplasm re- 

 tards the evaporation of water from the leaf, 83. Action of 

 the stomata, 84. Transpiration may be in excess of root 

 pressure, 85. Negative pressure, 86. Lifting power of 

 transpiration, 87. Root pressure may exceed transpiration, 

 88. Injuries caused by excessive root pressure, 89. Dem- 

 onstration of stomates and intercellular spaces, 92 page 33 



