xxviii • CONTENTS. 



CHAPTER XXII. 



THE ACTINOMETRY OF THE SEA. 



A new Field, § 879.— The warmest Waters in the Sea— where are they? at or below 

 » the Surface? 880. — The annual Supply of solar Heat uniform, 881. — Quantity 

 of Heat daily impressed upon the Earth, 882. — How far below the Surface does 

 the Heat of the Sun penetrate? 883. — The Stratum of warmest Water, 884. — Its 

 Position, 885. — The different Subjects for Observation, 886. — Expected Discover- 

 ies, 887. — Actinic Processes, 888. — The Reservoirs of Heat, 889. — The radiating 

 Powers of Earth, Air, and Water compared, 890. — An Office for Waves in the 

 Sea, 891. — A Reflection concerning Heat, 892. — Probable Relation between the 

 Actinometry of the Sea and its Depth, 893 Page 409 



