ON THE RAINFALL IN THE BRITISH ISLES. 473 
If, for the sake of computation, we bring in some other near stations, to 
get averages more free from local excess or defect, we find on the-mountain 
eeops 
feet. inches. 
Scawfell .2 .s0.%. S200ME £0is aie 64-0 
Greatend ........ OS Dad Aes srr: 66-0 
Esk Hause ...... BSI VILA 72:0 
Mean, vs yi P40] TE ea 67-3 
In the mountain passes :— 
feet. inches, 
Sprinkling "Parn /)\44.985 Maso? v. 121 
ptyehead’ Tarn \o'" ayo 110 
he styeS: o2 oi" LOPE Aap is 165 
Mier P AO: Se TSE o eee 132 
_ And at stations at the foot of the mountain :— 
(2) On the West. feet. inches. 
Wastdale Head.... DAT oy. eee 88 
Mosedale ........ O24. Ts, Tes cpanel 80 
Brant Rigg ...... COE tote aan 78 
Meam <2)... Doo Pies aes 83:3 
b) On the East. feet. inches. 
Seathwaite ...... Ae ne 134 
Stonethwaite .... 53 Digger ae 107 
Langdale ........ 25) eal ya chan dul 
J Weal sf...0 2's, A a 5 Pa Lea Gs 
i 2:/; Meanofaandb= 450 ........ 100°3 
__ Evidently the quantity of rain received on the surface of the ground near 
Scawfell is at a maximum at about half the height of the mountain, the 
‘quantity diminishing from this level both upwards and downwards. The 
diminution is not at the same rate on the two sides of the range, being very 
rapid on the west, sensibly slower on the east. Taking Fig. 1. 
average of these results as giving the most pro- H 
e general ratio, we find in 1400 feet of ascent 
quantity is reduced from 132-0 to 67-3 inches, and 
61 feet of descent from 132-0 to 100-3*. 
aw in a diagram (fig. 1) L MH, vertical ; with in- 
vals, LM=1061, MH=1400. Set off ordinates ; 
=67°3, m=132-0, 1=100-3 representing the quan- 
ities of rain received at the several elevations. As = 
he quantity of rain passes through a maximum some- 
there about the elevation M, it may be conceived to be 
spresented by a curve, in which the quantity at any 
levation would be less than the maximum, by a differ- 
mce (cd) which is a function of the difference(D) of this 
elevation from that of the maximum. L 
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alta ee a 
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s. 
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* Mr. Fletcher admits 134 inches as the most probable average. 
1868. 
2k 
