CONTENTS. 7 



Chapter III. — The Agents op Metamorphism — Continued. Page. 

 Part II. Aqueous solutions and solids — Continued. 



Section 1. Chemical and physical principles, etc. — Continue^.. 



Principles of chemical reactions applicable to ground waters — Continued. 

 Nature and speed of reactions — Continued. 

 Mechanical action — Continued. 



Nature of the chemical reactions — Continued. 



Smaller rock volume as the result of solution and deposition 



without change in chemical composition - - 101 



Eecrystallization and condensation without change of min- 

 erals 101 



Recrystallization and condensation with change of minerals. 102 

 Smaller volume as the result of solution and redeposition with 



change in chemical composition 103 



Crystallization and condensation of amorphous compounds. 103 

 Recrystallization and condensation of crystallized com- 

 pounds 103 



General statements 104 



Heat 105 



Relations of chemical action, mechanical action, and heat 110 



Precipitation 113 



Precipitation by change of pressure 114 



Precipitation by change of temperature 115 



Precipitation by reactions between aqueous solutions 116 



Pracipitation by reactions between aqueous solutions and gases 119 



Precipitation by reactions between solutions and solids 120 



Section 2. Circulation and work of ground water 123 



Universal presence-of water in rocks _ 123 



Pore space of rocks 125 



Circulation of ground water. 129 



Openings in rocks 129 



Form and continuity of openings _ 129 



Size of openings 134 



Supercapillary openings 137 



Capillary openings 13S 



Subcapillary openings 143 



Percentage of openings, or pore space 146 



Forces producing water circulation 146 



Gravity . . _ 146 



Heat 147 



Gravity and heat 148 



Mechanical action 149 



Molecular attraction _ 150 



Vegetation 152 



General statements _ 152 



