137 



Days of 



the 

 month. 



North 

 lat. 



West 

 long. 



PHYSICAL 



. OBSERVATIONS 





June 17 



■ 



29° 21' 



16° 6' 



Clear weather, calm at intervals : 

 the coasts of the small island of 

 Graciosa, and in the archipelago 

 of islets that lie to the north of it. 



Temperature of the Ocean, in the 

 channel, between the islands of 

 Alegranza and Santa Clara, where 

 the sea is only sixty-two metres 

 deep, 17' 8°, consequently 1*5° 

 colder than in the open sea, in the 

 same parallel. Temperature of 

 the air, 20°. 



18 



29 5 



17 10 



Temperature of the sea, far beyond 

 soundings, 18' 7° 5 temperature of 

 the air, 18- 3° : gentle breeze j clear 

 weather. Sun's force, 1*6° ; ther- 

 mometer exposed to the Sun, 19*9° . 









19 



28 28 



18 33 



Arrival in the road of Santa Cruz in 



the island of TenerifFe. 

 Dip of the magnetic needle, 69-35°. 

 Magnetic intensity, 238 oscillations. 

 Abode at the island of TenerifFe, from 



the 19th to the 25th of June. 



25 



26 51 



19 13 



Temperature of the sea, 20° 5 air, 

 18*8° j strong breeze at N. E. 



26 



25 15 



20 17 



Temperature of the ocean, 20° 3 tem- 

 perature of the air,' 21*2°. 



Dip of the magnetic needle, 67 '60° ; 

 very good observation (lat. 24° 53', 

 and long. 20° 58'). 



