260 Dr Davy on the Temperature of the Sea and the Air, 



calmness is such, that the sea is like a mill-pool, and reflects 

 the images of the moon and of Venus. The calm continued 

 through the night, till sunrise, when a gentle breeze sprung 

 up from the north-west. 



June 16. N. Lat. 45° 57', W. Long. 17°. 



The night was fine, and the wind gentle. During the last 

 twenty-four hours, there was no appearance of a current. 



Though it was completely calm during the night, and the 

 air very clear, yet there were no indications of dew. The cir- 

 cumstances ascertained by the thermometer and hygrometer 

 were certainly sufficient to prevent it ; and there is reason to 

 believe that they afford a good general explanation of dew 

 never making its appearance at sea at a great distance from 

 land. The observations on the temperature of the sea, and on 

 the temperature and dryness of the air, are interesting in other 

 respects, especially as indicating the effects of the sun's rays 

 on the air and sea by day, and the effect of the radiation, and 

 of heat, from the sea to the air, by night. 



June 17. N. Lat. 47° 5', W. Long. 14° 12'. 



The night was moderate. During the twenty-four hours a 

 current has set to the eastward. 



