iy Pea ae ree ee 
86 W. Hopkins on Changes of Climate. 
ern latitudes. It also appears from the table just referred to, that 
for the latitudes there given above 40°, the mean temperature fora 
whole parallel of latitude is higher in the south than for the cor 
responding parallel in north latitude. Now if this be due to the 
predominance of sea in the southern, and of land in the northem 
hemisphere, it would appear that the mean annual temperature of 
a sea station on the parallel of 50° N. latitude, would not ex 
that of a similar sea station in equal 8S. latitude, unless the tem 
peratures should be materially influenced by local causes. 
the lower temperature of the Falkland Islands, as compared with 
that of the corresponding northern parallel, must be due either t 
local influences, or to too high an estimate of the mean annual 
temperature in western Europe in the hypothetical case of the 
absence of the Gulf-stream. I am disposed to attribute it to the 
latter reason. The temperature of the Falkland Islands may be 
depressed by a southern continent not very distant from thet), 
and by consequent acenmulations of ice ; but it would seem that 
the region of western Europe about the parallel of 50° would, 1 
the absence of the Gulf-stream, be liable to an equal similar ir 
fluence from the Scandinavian region. 1 am disposed, therefote, 
to think that the isothermal lines for this case, represented on the 
map, ought to meet the coast of western Europe at points ralf 
more southerly, so as to indicate temperatures for each Joeality 
about 2° or 3° lower than those now indicated. I might have — 
made this correction on the map, but, as the determination of the — 
positions assigned to these isothermals was entirely independe? 
of any comparison with places in the southern hemisphere, 
have thought it better to allow them to remain, as a proof 
approximate accordance of results arrived at by independent col 
siderations. These corrected positions of the isothermals wow 
assign to Snowdon, in the absence of the Gulf-stream, a mea 
annual temperature of 39° or 40°. 
9. In more northern latitudes than that of Snowdon, our fore- 
going reasoning would lead us to conclude that the mean anni 
h 
but only in a comparatively small degree for insular stations and 
re is 
and of Iceland, under our present hy pothesis, may be taken some 
what greater than those given in the table of ¢ 13, p. 91, 
the case in which the absence of the Gulf-stream was a 
The temperature of the Alps would probably differ little: from | 
that given in the same table. The correction mentioned 10 pe 
preceding paragraph, if adopted, must, of course, be applied 
to these temperatures. 
(To be continued.) 
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