442 



APPENDIX 



„ 26. A bottle-drift from Ascension to Guernsey. 

 „ 27. Bottle-drift on the Canary Islands. 

 „ 28. Bottle-drift on Madeira. 



„ 29. Sargasso or Gulf weed in Azorean beach-drift. 



„ 30. Iguanas, snakes, and alligators in the Turks Islands. 



., 31. Draccena draco (Dragon-tree). 



,,32. A comparison of the old and later charts of the Turks 

 Islands. 



„ 33. Plants collected by George Forster in Fayal. 



„ 34. Observations on the medanos or moving sand-hills of the 



Ancon coast region in Peru. 

 „ 35. Bottle-drift in high latitudes of the North Atlantic. 

 „ 36. The wells of Pico in the Azores. 

 „ 37. Uncinia. 



„ 38. The fruiting behaviour of Atriplex portulacoides, L., at 



Salcombe, South Devon. 

 „ 39. Recent observations in the western Bahamas by Dr. 



Vaughan and other American geologists. 



Note 1 (p. 70). 



The time occupied by bottle-drift in the traverse in the Main 

 Equatorial Current from the Gulf of Guinea to the coast of Brazil 

 and to the West Indies. 



Since the data for bottle-drift at my disposal only apply to the 

 traverse west of St. Paul's Rocks and Ascension, it will be necessary 

 to supply the deficiency from an authoritative nautical publication. 

 In so doing we shall be able to compare results obtained by the 

 navigator with those supplied by the floating bottle. 



It is highly probable that the drifting bottle in the first half of 

 the passage would travel eastward at a greater rate than twenty 

 miles a day, which is the average rate to the west of St. Paul's Rocks. 

 This is directly indicated in the Admiralty publication, the Africa 

 Pilot (Part I., p. 52, London, 1907), where we find the following 

 statement : " The Equatorial Current appears to attain its greatest 

 volume and velocity during the season of the northern summer. 

 From the African coast to about the 15th degree of west longitude, 

 the maximum strength, sixty miles a day, has been observed in 

 May and June, and during this period its direction is more regular, 

 being west (true). Westward of that meridian, at successive later 

 periods, or between July and October, it is probably subject to 

 irregularities in strength, depending on the winds." 



This current is regarded in the pages of the work above named 

 as commencing in the neighbourhood of Anno Bom in the Gulf 

 of Guinea. From this locality to the West Indies (Trinidad and the 

 neighbouring islands) the distance along the track of the current 

 would be about 4000 miles. We can allow for the increased velocity 

 in the first third of the traverse from the Gulf of Guinea to the West 

 Indies by assuming an average drifting-rate of thirty miles a day 

 for a bottle over the whole distance. This gives a result of 133 



