G2 On the Temperature of the Sea, and its Influence 
The inferences from tlie rain table clearly sliovv that the rain 
wind comes from the south-west, and thus the western coast line 
is fully exposed to its influence ; but, confirminjj every point as 
we pass, by actual observations, we jjive the rain deposited by 
different winds on the west and east of these islands. 
Table VIII. — Showing the Quantity of Ttain in Inches which falls in the 
South- West of Ireland, and in Suffolk, with the Wind at the several 
points of the Compass, for One Year.* 
s. 
S.W. 
AV. 
N.W. 
N. 
N.E. 
E. 
S.E. 
Total. 
4-2 
12-7 
8-2 
2-6 
3-1 
3-1 
3-1 
3*5 
40-5 
Monk's Eleigh .. 
2-7 
2-7 
4.4 
2-4 
2-8 
2-0 
3-1 
1'7 
21'8 
Toomavara, mean of\ 
G-6 
10-6 
6*0 
2-8 
2-3 
2'2 
2'2 
3-2 
35-9 
Thus at Toomavara half of the whole amount of rain fell with 
the west and south-west winds ; but in Suffolk, from its con- 
tiguity to the German Ocean, the rainfall is more equally appor- 
tioned to the winds from the other points of the compass. 
It must, however, be considered that the rain-bearing- wind is 
almost wholly from the south-west : the other winds rather act as 
condensers to deposit the moisture, than as carriers to bring it. 
Thus in Cornwall it very commonly happens that heavy but tran- 
sient rainfall takes place on a sudden shifting of the wind to the 
south-east, and on referring to my register of the weather for 
the past fourteen years, I find that there were forty-five days in 
which the amount collected exceeded an inch, and in the majo- 
rity of cases the heavy rain was thrown down by a south-east 
wind. Only twice during the same period did an inch of rain 
fall with a north-west wind, and eleven times with the wind at 
the south-west. 
From this cause, and especially on our eastern lands, the 
moisture is often condensed so as to fall as rain, not under the 
action of the wind which brought it, but by a shift of the wind 
bringing a current from a colder region. 
In tracing the rainfall over the rugged surface of the land 
we find great variation in the quantity — often within short dis- 
tances — resulting both from the relative elevation of the land, 
and the configuration of its surface. 
At the Scilly Isles, and at the Land's End, before the rain- 
clouds are much disturbed by land influences, the annual quan- 
* Transactions of British Association for the Advancement of Science, 1843 
and 1845. 
