136 METEOROLOGICAL OBSERVATIONS. 
To meafure the quantity of rain, I fixed a tube about 
three inches diameter, in fuch a manner as to receive the 
rain as it fell; which I meafured as foon as it was over, 
and added up the whole of each month together. In this” 
account the /now and hail are included: Thefe were 
meaiured by taking up in the tube all the {now or hail that 
fell on a fpace equal to its furface, and then melting it. 
The method of meafuring the quantity of evaporation by: 
a tube fufpended in the air being uncertain and inaccu- 
rate, thofe obfervations are omitted. 
The greateft height of the barometer this year, was on 
the 22d and 23d of February: The mercury at 12° on 
each of thefe days, was at 30.6 inches. The leaft height 
was 28.61 inches, on December 26th at 12". The ther- 
mometer on the 8thof July, at 1253, rofe tag6°4: On 
February the 22d, at 8 a. M. it flood at g°+ below o. 
At both thefe times the thermometer was hung in the 
open air, in a fhade: The former was the greateft, the 
latter its leaft height. The quantity of rain this year 
amounted to 26,55 inches. 
On the 17th of July there was an Aurora, uncommon . 
in this refpect, that there were feveral appearances of it in 
the /outh: The firft of thefe was about g*. It began about 
20° above the horizon and inftantly {pread itfelf in a ho- 
rizontal direCtion to the diftance of 30° each way from 
the meridian. For the {pace of one quarter of an hour 
there were five fuch appearances, all in the fouth as*before; 
their duration was not more than half a minute, and their 
colour a pale light, exadly like that of the Aurora in the 
north. ‘ 
There was alfo a remarkable Hurricane this year, 
the effects of which were principally felt at Salisbury, 
Amesbury, and Haverhill. Thefe towns lie on Merrimack 
river, on the north fide; Salifbury being the place where 
the river empties itfelf into the ocean, 
The 
