CONTENTS - ix 
CHAPTER XV. 
FIELD WORK. PAGE 
Observations on the Habitat of Plants—Their Time of Flowering—Their Means 
of Protection—Their Mode of Growth—The Insects that Visit Them, ete. 104-107 
PART Ill. 
THE PHYSIOLOGY OF THE PLANT. 
CHAPTER XVI. 
THE LIFE OF THE CELL. 
Protoplasm, its Composition and Properties, as observed in Protococcus— 
Differentiation - ~~ - - - - - . . - 111-114 
CHAPTER XVII. 
THE PASSAGE OF WATER THROUGH THE PLANT. 
Absorption of Water by the Roots—Passage of Water from the Roots to the 
Leaves—Transpiration—Rate of Passage of Water through the Plant - 115-119 
CHAPTER XVIII. 
RELATION OF THE PLANT TO THE SOIL. 
The Substances necessary to the Life of the Plant ascertained by ** Water 
Culture ’’--These Substances must be in Solution—Absorption of Nitrogen 
by Leguminous Plants - - 2 “ - : . - 120-124 
CHAPTER XIX. 
THE RELATION OF THE PLANT TO THE AIR. 
Composition of Air. I. Respiration of Plants—The Absorption of Oxygen and 
the giving out of Carbon Dioxide. Heat given out in Respiration. 
II. Assimilation -The Making of Starch—Conditions necessary - - 125-131 
CHAPTER XX. 
GROWTH. 
Conditions necessary for Growth—Effect of External Conditions: Light, 
Temperature, Moisture, Alternation of Day and Night’ - - *. 182-188 
APPENDIX A. 
Note on ‘‘ Water-Culture” - - . - . - - - 141 
APPENDIX B, 
List of Apparatus necessary for the Experiments described in Part III. - 142 
