temperature of the ocean and atmosphere, &c. 283 
The law of the regular variation of temperature, is fre- 
quently interrupted. Even in fine weather, when the air is 
not in. motion, it is subject to interruption. During a calm, 
the variation of temperature is nearly the same as on land, 
the maximum degree of heat not being at noon precisely, 
but some time after, and for the same reason ; because there 
is an accumulation of heat, and not only in the ship, but 
actually in the water itself, as I may show by noticing the 
temperature of the air and of the sea, during even a short 
calm, hardly of 24 hours duration. 
August 7th. N. lat. 2 0 10" E. long. 76° 37". 
Hour. Temp, of air. Of the sea. 
6 A. M. 
0 0 
7 8 ,5 
- 
• » 
80 
8 
79,5 
- 
81 
10 
80 ,5 
- 
81,5 
12 
- 82 
- 
82,5 
2 P. M. 
82,5 
- 
83,5 
3 
82 
- 
83,5 
4 
81,5 
But the law 
is more remarkably interrupted during storms 
and unsettled weather, as a couple of instances will be suffi- 
cient to prove. 
March 17th. N. lat. 4 0 . W. long. 18 0 30" 
Hour. 
Weather. 
Temp, of air. 
of the rain water. 
3 A. M. 
Clear 
80 
11 
Rain approachin 
g 77 
76 
ii° 30 
Just passed 
74 
73 
12 
Cloudy 
79 
1 P. M. 
After a shower 
76,5 
76 
4 
- 
75 
74 
