CONTENTS. xxi 



909.— An immense Current, 911.— Tide Rips, 914.— Pulse of the Sea, 920.— 

 Diurnal Change of Sea Temperature, 922.— The Fisheries, 925.— The Sperm 

 Whale, 926 Page 308 



CHAPTER XVn. 



STOEMS. 



Data for Plate V., § 929.— Typhoons, 936.— Monsoons in the China Sea, 937.— Mau- 

 ritius Hurricanes, 938. — West India ditto, 939. — Jansen on Hurricanes and Cy- 

 clones, 940. — Extra-tropical Gales, 950. — The Steamer San Francisco's Gale, 951. 

 — More Rains, Gales, &c., in the North than in the South Atlantic (Plate XIII.), 

 956 326 



CHAPTER XVIII. 



ROUTES. 



How Passages have been shortened, <§ 959. — How closely Vessels follow each other's 

 Track, 961.— The Archer and the Flying Cloud, 962.— The great Race-course upon 

 the Ocean, 964. — Description of a Ship-race, 966. — Present Knowledge of the 

 Winds enables the Navigator to compute his Detour, 991 336 



CHAPTER XIX. 



A LAST WORD. 



Brussels Conference, § 996. — How Navigators may obtain a Set of the Maury Charts, 

 997.— The Abstract Log, 998 345 



CHAPTER XX. 



FORCE OP THE TRADE-WINDS OF THE SOUTHERN HEMISPHERE. — PECULIARITIES IN 

 ITS ATMOSPHERIC CIRCULATION. 



The Spirit in which the Researches touching the Physics of the Sea have been con- 

 ducted, § 1002.— Reasons for supposing Crossings of the Air in the Calm Belts, 

 1003. — The "brave west Winds" of the Southern Hemisphere; their Strength 

 and Regularity, 1004.— Counter-trades, 1005.— Measuring the Strength of the 



Trade-winds, 1006.— The S.E. stronger than the N.E. Trade-winds, 1007. 



Waves, 1008.— New Facts in Meteorology, 1009.— Calms and Gales on opposite 

 Sides of the Equator compared, 1010.— The propelling Power of the Winds of 

 the Southern Hemisphere; whence derived, 1011. — Why do the Counter-trades 

 blow toward the Poles? 1012. — Precipitation between the Parallels of 55° and 

 60° N. and S. compared, 1013.— A heavy Rain-fall, 1014.— The Counter-trades 

 of the Southern Hemisphere vapor-bearing Winds, 1015.— The latent Heat of 

 Vapor, 1016.— Its Amount, 1017.— Icebergs, their Offices, etc., 1018.— The 

 physical Features of the Antarctic Continent, 1019.— Precipitation the Cause 

 of the low Barometer in high southern Latitudes, 1020.— A perpetual Cyclone, 

 1021.— Conclusions, 1022.— Dr. Jilek's Description of the Antarctic Regions, 

 1023 349 



CHAPTER XXI. 



THE SUBMARINE TELEGRAPH OF THE ATLANTIC. 



Its Histoiy, § 1025.— Attempt to be renewed, 1026.— Causes of Failure, 1027.— 

 The Probabilities of Success, 1028.— The real Question, 1029 373 



