344 Analysis of Screntifie Books. 
deep seas, this must necessarily be a process of some duration. ‘The 
shallow waters, on the contrary, soon assume the temperature of the 
ambient air, and continue to decline with it in heat. Upon the return 
of spring the contrary effect is produced. ‘The great deeps must again 
repass the fortieth degree before the superficial waters can take the 
higher temperature of the incumbent atmosphere, ‘I'he consequences 
we should expect from this progression, would be an increase of ' 
humidity in December and January, and a rapid decrease in the four 
following months; an expectation which we shall find correct in our 
further inv estigation. 
‘“< There is another law of the aqueous fluid, which we ae also 
expect to have an influence upon the emission of its stcam—the evo- 
lution, namely, of heat in the process of congelation, and its absorp- 
tion during the liquefaction of ice. ‘The British» Isles are placed in 
such a position as would induce us to suppose that, at particular sea- 
sons of the year, this influence might be perceptible in one direction 
more than in any other. We may bring this idea to the test, by com-= 
paring together the northerly and southerly Ww Anas as is done in the 
following table : — 
Tasez II, Shewing the Effect of the Ice in the North Seas upon the 
Dew Point. 
SWS SE. NE NNW. 
fe) 
September ......+.- 58 
CUGEQHEE Ne. 5) -efick'e\ oie. nl 
November ......... 47 
December's: veyai-e 34/6 42 
SHIMIAEY a hg tate apse 38 
LECT dese le arate 36 
IWATE cee ci ajaanie Core 42 
ee RR REE Re aS A7 
IVES chepicn aenebt>. msuiey's 51 
UME th he. o.ossai es \90 hs 58 
POLY | 5) ahs use woe nies 58 
11 eR A RR ea 60 
‘« Here we may observe, that the decline of the vapour from Sep- 
tember to December is exactly equal in both classes, but from that 
time it ceases about the temperature of 32° in the northerly winds, and 
continues in the southerly to the month of February. In March, 
again, the temperature of the latter has increased from the minimum 
6°, but in. the former it still remains at 32°. In April, on the con- 
trary, the increase in the northerly winds excecds that of the 
southerly ; and in May, they have again attained their original relative 
