CONTENTS. ix 



CHAPTER X. 

 THE CHEMICAL CONSTITUENTS OF PLANTS. 



PAGE 



1. The Water in the Plant Amount of Water in Plants Water 

 in the Protoplasm Water in the Cell Walls Water in the 

 Intercellular Spaces Equilibrium of the Water in the Plant 

 Disturbance of Equilibrium Evaporation of Water Amount 

 of Evaporation The Movement of the Water in the Plant 

 2. As to Solutions 3. Plant Food The Most Important 

 Elements The Compounds Used How the Food is Obtained 

 How Transported in the Plant 166 



CHAPTER XI. 

 THE CHEMICAL PROCESSES IN THE PLANT. 



1. Assimilation 2. Metastasis Its General Nature Trans- 

 formation of Starch Nutrition of Protoplasm The Storing of 

 Reserve Material The Use of Reserve Material The Nutri- 

 tion of Parasites and Saprophytes The Formation of Alkaloids 

 Results of Metastasis 178 



CHAPTER XII. 

 THE RELATIONS OF PLANTS TO EXTERNAL AGENTS. 



1. Temperature General Relations Absorption of Water as Af- 

 fected by Temperature Evaporation Assimilation Metasta- 

 sis Death from loo High a Temperature Death from too 

 Low a Temperature 2. Light: General Relations of Light 

 to Assimilation, Light, and Metastasis 3. Heliotropism 

 4. Geotropism 5. Certain Movements of Plants : General 

 Statement, Spontaneous Movements, Movements Dependent 

 upon External Stimuli, Movements of Nutation, Movements 

 of Torsion . ., . 184 



PART II. SPECIAL AXATOMY AND PHYSIOLOGY. 



CHAPTER XIII. 

 CLASSIFICATION. 



Principles of a Natural Classification Critical A Comparison of 



several Systems 202 



