616 Meteorological Obfervations. 
mountains, a part of the ftream of north-eaft 
air will flow over the mountains, another part 
will revert and circulate fpirally between the 
fummit of the country and the eaftern fhore, 
continuing to move towards the fouth; and 
_ thus be changed from a north-eaft to a north-— 
weft wind. (See Botanic Garden, part 1ft). 
In a letter which I lately received from Dr.* 
Darwin, he coincides with me in opinion, that 
‘*the prevalence of the fouth-eaft winds at 
Liverpool, depends upon fome atmofpheric 
eddy produced by the fituation of the place.” 
In the fame letter this ingenious philofopher 
obferves, ‘* that the knowledge of the winds, 
their origin or caufe, is the principal fource (I 
mean the caufe) not the confequence of all the 
other atmofpheric phenomena in my opinion. 
All the winds of the N. E. come directly from 
{nowy countries ; and as the {now is evaporated 
by them, great cold is produced: firft by the 
thawing of the fnow into water, and then by 
evaporating the water, which I fuppofe to be 
done at one procefs by the air. Then the fouth- 
eaft winds, when they bring froft, are fuperior 
currents of north-eaft winds driven back. Thefe 
I efteem to be the fources of froft in this country. 
And how thefe winds are produced or generated 
for fix weeks together, feems to me to be the 
greateft defideratum, as I have endeavoured to 
thow in a note in the Botanic Garden. 
‘* Experiments 
