138 



Days of 



the 

 month. 



North 

 lat. 



West 

 long. 



PHYSICAL OBSERVATIONS. 



June 26 



25° 15' 



20° 11' 



Intensity, 239 oscillations, computed 

 in calm weather, to the south-west 

 of Cape Bojador, at 62 leagues 

 distance. 



27 



22 52 



22 13 



Sea, 20°; air, 20 1° ; fresh breeze 

 from the N. E., the Sun's force 

 appearing only 2°. In the night, 

 temperature of the air, 19* 3°. 



28 



21 30 



25 23 



Air, 22° j brisk wind from the N.'E. 



90 leagues north of Cape Verd. 

 Dip of the magnetic needle, 64*65° : 



very good observation (lat. 21° 29% 



and long. 25° 42'). 

 Oscillations 237. 



29 



20 8 



28 51 



Temperature of the sea, 21*2° ; air 

 20°. From ten in the morning to 

 five in the evening, the thermome- 

 ter did not vary 0*8°, while the 

 breeze blew very strong. 



Dip of the magnetic needle, 63*52°. 

 Oscillations 236 (at 60 leagues 

 N. N. W. of the island of Santa 

 Antonio) ; latitude 19° 54', longi- 









tude, 28° 45'. 



30 



18 53 



30 41 



Temperature of the sea, 21" 8° j tem- 









perature of the air, 21*2° 3 fine 



weather. 

 Cyanometer, 22*4°. 

 Hygrometer, 44° Deluc(8l , 5° Saus- 



sure). 



