Vi OONTENTS. 
CHAPTER V. 
THE CHEMISTRY AND PHYSICS OF PLANTS, 
PA 
The Water in the Plant. Water in the Protoplasm. Water in the 
Cell-Walls. The Equilibrium of the Water in the Plant. Dis- 
turbance of Equilibrium. Evaporation of Water. The 
Amount of Evaporation. The Movement of Water in the 
Plant; Root-Pressure; the Flow of Water; No Circulation of 
Sap. Plant Food. The Compounds used. How the Food 
is obtained. How the Food is transported in the Plant. 
Starch-Making or Assimilation. Digestion and Use of Starch. 
The Storing of Reserve Material. The Use of Rescrve 
Material. The Nutrition of Parasites and Saprophytes. Alka- 
loids and Acids. Results of Assimilation and Metastasis. 
Temperature as affecting Vegetation. Light as affecting 
Vegetation. Movements of Plants...............c0008 craves 68 
CHAPTER VI. 
CLASSIFICATION AND DISTRIBUTION. 
General Laws of Classification. Principal Groups. General 
Relationship of the Branches. Geueral Distribution of Plants. 
Botanical Regions. Distribution of Plants in Geological Time; 
Pabulaty View. .ariaesisivs ates acnoarnemnwe weve sien Rietegintha tas 97 
CHAPTER VII. 
BRANCH I, PROTOPHYTA: THE SEXLESS PLANTS. 
General Characters. Slime-Moulds. Bacteria and Yeast-Plants, 
GReOD SIM C8 sass. craven maernoreeandeensae: Heew oe nee sacas con 105 
CHAPTER VIII. 
BRANCH Il ZYGOPHYTA: THE UNISEXUAL PLANTS, 
General Characters, Zodsporese; Pandorina; Water-Net; 
Water-Flannel; Sea-Lettuce; Kelp and its Allies. Conjugate; 
the Desmids; the Diatoms; the Pond-Scums; the Black- 
