TO GUAHON. 187 



longitude 118° 9', I took advantage of the calm to 

 make an experiment with the 8ix-tlieimometer, 

 and obtained the following results : 



Temperature of the air on the surface of the ocean + 73° 00 

 Temperature of the water on the surface of the ocean -f- 71 90 

 Temperature of the water at the depth of 25 fathoms + 51 10 



100 - + 52 80 



300 - + 4-4 00 



The transparency of the water was about 13 fathoms. 



In the calm, on the 14th of September, of which 

 I also took advantage, the latitude was 33° 51' f 

 longitude 14-7° 38'. 



Temperature of the air on the surface of the ocean + 75° 00 



Temperature of the water on the surface of the ocean + 72 20 



Temperature of the water at the depth of 4 fathoms + 72 00 



8 - -f- 70 90 



15 - +68 10 



25 - +57 60 



- - - 50 - f 54- 00 



100 - + 51 00 



408 - + 42 00 



Transparency of the water 1 1 fathoms. 



While I was making these observations in the 

 boat, a shark came so close to us that a sailor struck 

 him with an oar, for which he, however, revenged 

 himself by biting througli the string of my Six- 

 thermometer, and I lost the instrument in a mo- 

 ment, when I had, for the first time, sunk it to five 

 hundred fathoms, and was very anxious for the 

 result. The string I had to this was made in 

 Oonalashka of whale-sinews. 



