CONTENTS Xlll 



I' ACE 



Water.— Path of Water Ascent.— Intluence of Environ- 

 ment on the Water Conducting Tissues.— Illustrative 

 Studies I01-I22 



CHAPTER Mil 



Intake .\nd Distribution of 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 Chloroplasts.— 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 of 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 p:iements to those of the Next. — 

 Character of Food while in Transi)ort. — The Pro- 

 l)clling Power in Food Transjxirt. — Illustrative Studies. 157-174 



