432 APPENDIX. 



be deduced, the best calculated to supply funda- 

 mental data. Yet some singular results appear in 

 them. Among these is tha statement in the South 

 Sea, that in 18° N. latitude, and 76 fathoms* depth, 

 in December, the water was Q^" R. warmer than 

 in 11° N. latitude, and 70 fiithoms' depth, in No- 

 vember. Perhaps the local places of observation 

 have had here some influence. The observation in 

 11° latitude lies in the west of the Mariana islands, 

 and in the north of the Philippines, consequently 

 sheltered against the warmer currents from the 

 south, by a kind of wall, and open only to the 

 north, while on the other hand, the place, in 18° 

 latitude, lies more in the open sea. The temper- 

 ature, found at a depth of 90 fathoms, in the Chi- 

 nese Sea, to the west of Lu9on, is remarkably cold ; 

 perhaps in consequence of the north-east currents 

 prevailing in December. 



Almost daily observations on the temperature 

 were made in the Atlantic Ocean, from the 20th 

 of April to the 13th of June, 1818, mostly at a 

 depth of 70 fathoms. In order to balance the 

 possible errors of the observations which may arise 

 from the difference in the time that the ther- 

 mometer was under water, I have added several 

 too-ether, and noted the mean number. They are 

 in the following table. The figures in parentheses 

 show the number of observations the mean of 

 which is given. 



