CONTENTS Xlll 



PAGE 



Water. Path of Water Ascent. Influence of Environ- 

 ment on the Water Conducting Tissues. Illustrative 

 Studies 101-122 



CHAPTER VIII 



INTAKE AND DISTRIBUTION OP GASES 



Oxygen and Carbon Dioxide Necessary to Plants. The 

 Stomata. The Relation of Stomata to the Environ- 

 ment. The Lenticels. The Intercellular Spaces. 

 Diosmosis of Gases into and from Living Cells. Motive 

 Power in the Distribution of Gases throughout Plants. 

 Illustrative Studies 123-137 



CHAPTER IX 

 CONSTRUCTION OF THE PLANT'S FOOD 



The Source and Uses of Food. Food Building Apparatus. 

 The Chlorpplasts. The Sun's Energy. The Palisade 

 Cell the Chief Photosynthetic Unit. Relation of Leaf 

 as a Whole to Photosynthesis. Conditions Affecting 

 Photosynthesis. Photosynthesis in the Lower Plants. 

 Synthesis of Food without Light. Illustrative Studies . 138-156 



CHAPTER X 



TRANSPORT or FOODS THROUGHOUT THE PLANTS 



Need of Circulatory Tissues. Evidence that the Phloem 

 Carries the Food. Evidence that the Tracheal Tissues 

 Assist the Phloem in the Upward Transmission of Food. 

 Relation of Phloem Elements to Other Tissues. 

 The Course of Food Distribution. Annual Additions 

 to the Food-conducting Tissues. Relation of One 

 Year's Phloem Elements to those of the Next. 

 Character of Food while in Transport. The Pro- 

 pelling Power in Food Transport. Illustrative Studies. 157174 



