134 



Days of 



the 

 month. 



June 12 



North 

 lat. 



35° 8' 



13 ; 34 30 



West 

 long 



17 av 15' 



PHYSICAL OBSERVATIONS. 



16 55 



Calm, hazy weather ; a little rain at 

 nine in the morning - } at fifty 

 leagues distance from the coasts of 

 Africa, to the west of Cape Blanco. 



Temperature of the sea, 16*2° ; temp, 

 of the air, 20-6°. At eight in the 

 evening, the sea 16-2° j the air 

 15-7°. 



Hygrometer, 47 '8° Deluc (84° Saus- 

 sure). 



Variable weather, calm, rainy. From 

 eleven in the morning clear sky, 

 without clouds j in the night, 

 breeze from the west. 



Temperature of the sea, 16*3o (at a 

 depth of fifteen metres, 15*7°) j 

 temperature of the air, 19'7 0 # 

 thermometer exposed to the Sun, 

 20-3° ; Sun's force, 0 5° j temper- 

 ature of the air at eleven at night, 

 137°. 



Hygrometer, 54*5° Deluc (87*5° Saus- 

 sure). 



Cyanometer, 16° ; blue color of the 

 sea 34°. The sky has a reddish 

 blue tint, almost violet, a singular 

 phenomenon, which 1 have also 

 sometimes observed in the Pacific 

 Ocean, especially in the southern 

 hemisphere, and without the sea 

 being green. 



