80 Dr. Davy on the Temperature of the Sea and the Air, 

 April 22. S. Lat. 30° 6', E. Long. 11° 42'. 



The night was fine, and the breeze gentle. At noon the cur. 

 rent was setting strong to the west, and a little to the south. 



April 23. S. Lat. 28° 45', E. Long. 9° 58'. 



The night was fine. After sunset every thing on deck 

 seemed to be covered with dew ; but a glass wiped clean and 

 dry, and exposed to the air for half an hour, remained perfect- 

 ly dry. The sails were quite wet in the morning. Does this 

 effect arise from the deliquescence of salt, or is it owing part- 

 ly to this, and partly to the formation of dew connected with 

 the deliquescent salt, and not occurring when the latter does 

 not take place ? Perhaps the salt may have a disposing ef- 

 fect in regard to dew, somewhat similar to that which lime 

 has in respect to the formation of saltpetre. 



April 24. S. Lat. 26° 55', East Long. 7° 34'. 



The night was fine. The current during the last forty- 

 eight hours has been setting pretty strongly to the west. This 

 morning a flying-fish was seen. 



