7 
West and North-west Winds of New-England. 311 
This, however, was not the fact, even for a moment. Of 
isetcooind 
course, during this part of its progress, the south-west 
blew beneath the cloud: while that which — the 
blew, in the first part of its progress, only in 
gion ; and did not strike the earth, until it chia n 
thesound. These phenomena, ) far 
ject, | saw several times ited du 
Greenfield. Nor have I i 
rise, and progress, of thun 3; alm 
rise in the north-west, and are Gigiented 58 a wind, blow- 
ing from that quarter, and a to blow, from one to 
r days, like those of the wi 
In the summer of 1809 a > diedeetdtiran passed over 
New-Haven from the north-west with great rapidity. It 
continued, as I judged, from an hour to an hour and a half. 
But, although the clouds moved rapidly to the south-east, 
a south-west wind blew the whole of that day ; and, while 
the thunder-storm was over head, blew with great violence. 
This plainly would not have been possible, had not the 
Stream of air, which moved these clouds, args. 
through the atmosphere at some distance from the earth.* 
On Wednesday evening, Oct. 15th 1799, Mr. Day, Pro- 
fessor of Mathematics and Natural Philosophy i in Yale rene 
lege, and myself being on our return from a journey of 
several weeks up the Mohawk, and the Hateoe, bilge tadlged at 
Pittsfield. ‘The weather, during the whole of our journey, 
’s well as before, had been extremely mild; except that a 
very light frost, on the evening of the fourth, had changed 
ina small degree the annual foliage through a tract along 
the Mohawk of about fifteen miles. Throughout the day, 
ich we arrived at Pittsfield, a strong and warm south- 
west wind had blown unceasingly. At nine o’clock in the 
evening a furious blast came from the north-west ; and in 
an instant changed the temperature of the air to a severe 
fold. A violent rain, accompanied by thunder ee nee 
ning, fell for an hour, At ten, the rain ceased ; we 
Went out, to examine the face of the heavens. The rahclas 
had become broken: and we discerned with perfect dis- 
tinetness the inferiour ‘brates moving rapidly rom the 
north-west ; a second, immediately above it, moving ag from 4 
“Tsaw the same facts again repeated in the summer of 1810 
