CONTENTS 



Methane in the Atmosphere 144 



Dieter H. Ehbalt 



Atmospheric Sulfur and Its Links to the Biota ..... 159 

 Frank B. Hill 



Sulfur, Nitrogen, and Carbon in the Biosphere 182 



Edward S. Deevey, Jr. 



SESSION III: Oceans, Estuaries, and Freshwater 



Chairman: Edward R. Baylor 



Phase Phenomena in the Calcite— Seawater System .... 191 

 Robert C. Cooke 



Particulate and Dissolved Organic Carbon in 



the Oceans 204 



Gordon A. Riley 



Carbon in Estuaries 221 



George M. Woodwell, Peter H. Rich, and 

 Charles A. S. Hall 



Carbon in Freshwater Systems 241 



Robert G. Wetzel and Peter H. Rich 



SESSION IV: Symposium Lecture 



Chairman: George M. Woodwell 



Is There Intelligent Life on Earth? 264 



Preston Cloud 



SESSION V: Carbon on Land 



Chairman: Jerry S. Olson 



Carbon in the Biota 281 



Robert H. Whittaker and Gene E. Likens 



Terrestrial Detritus and the Carbon Cycle 303 



William A. Reiners 



VI 



