viii CONTENTS. 



PAGE 



III.— The CUREENTS 294 



General Eemarks, 294 ; Drift of Bottles, &c., 295—297 ; Circulation 

 of the Ocean, &c., 297—298; Depths of Current, 298—299; 

 Definitions, 299 ; Current Systems, 299—301. 



1. Rennell's Current, or the Occasional Current Athwart the 



Entrance of the English Channel 301 



2. The North African Current, an Easterly and S.E. Drift to the 



Coasts of Europe and Africa 312 



3. The Guinea Current, being an Easterly Stream Across the Atlantic, 



and along the Coast of Africa, into the Bights of Benin and Biafra 32& 



4. The Sargasso Sea 386 



5. The North Equatorial Current 343 



6. The South Equatorial Current 347 



7. Currents of the Caribbean Sea and the Gulf of Mexico 353 



8. The Gulf Stream 373 



9. North-easterly Set to the Coasts of Western Europe, &c 421 



10. The Arctic or Labrador Current 430 



Icebergs, Ice Islands, and Drift Ice in the Arctic Current 441 



rV.— MAGNETIC VARIATION AND DIE, with a Chart 455 



v.— PASSAGES OVER THE NORTH ATLANTIC OCEAN .... 455 



1. General Remarks and Great Circle Sailing 459 



2. To and from the English Channel 462 



3. To and from the St. George's Channel 467 



4. Passages between England and Gibraltar 474 



6. Across the Equator 475 



Leaving the Channel, 477 ; Passage to Madeira, 478 ; Approaching 

 and Crossing the Equator, 481 ; East or West of the Cape Verde 

 Islands, 498 ; The Return toward England, 501. 



6. Routes to and from the Senegal and Gambia 501 



7. Remarks and Directions for the Navigation to and on the Coast of 



Western Africa 503 



8. Passages to and from the West Indies, with Instructions for Navigating 



therein 6Ii 



Directions for Sailing to and from the NN'est Indies and North America, 



from the Derrotero de las AntiUas =...., 619 



Particular Instructions for the Navigation of the Windward Islands, &c. 5ft5 

 Gsneral Remarks on the Navigation of the Caribbean Sea, from Lee- 

 ward to Windward, by Lieutenant Greevelink 529 



Steam Navigation between Tobago and Demerara 631 



Navigation to Jamaica via St. Juan, Porto Rico, Cape Haytien, and 



St. Jago de Cuba 532 



Between Grenada and Jamaica 534 



Jamaica to the Bar of Maracaybo, by Captain Edw. Dunsterville ... 535 



The Channels of Providence 536 



Directions for Proceeding to Demerara, &c., from the N.E 537 



