VI CONTKNTS. 



CHAPTER V. 



THE CHBMISTBY AND PHYSICS OF PLANTS. 



PAGE 



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. Erapoxatibn of Water. The 

 Amount of Evaporation. The Movement of Water in the 

 Plant; Root- Pressure ; llie Flow of Water; No Circulation of " 

 Sap. Plant Food. The Compounds used. How the Food 

 is obtained. How the Pood is transported in the Plant. 

 Starch-Making or Assimilation. Digestion and Use of Starch. 

 The Storing of Reserve Material. The Use of Reserve 

 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 68 



CHAPTER VI. 



CLASSIFICATION AND DISTRIBUTION. 



General Laws of Classification. Principal Groups. General 

 Relationship of the Branches. General Distribution of Plants. 

 Botanical Regions. Distribution of Plants in Geological Time; 

 Tabular View 97 



CHAPTER VII. 



BRANCH I. PBOTOPHYTA: THE SEXLESS PLANTS. 



General Characters. Slime-Moulds. Bacteria and Yenst-Plants. 

 Green-Slimes 105 



CHAPTER Vm. 



BRANCH II. ZYQOrHYTA: THE UNISEXUAL PLANTS. 



General Characters. ZoOsporese; Pandorina; Water Net; 

 Water-Flannel; Sea-Lettuce; Kelp and its Allies. Conjiigalee; 

 llie Desmids; the Diatoms; the Pond-Scums; the Black- 

 Moulds , .. .,,....., 115 



