122 METEOROLOGICAL OBSERVATIONS. 
In this experiment, the evaporation from thefe four very 
fmall plants was 10944 grains; amounting to about 43 
cubic inches of water, in thirty days. ‘The evaporation 
in the fame time from the vetlel fufpended in the air, was 
4.25 inches in depth: The quantity therefore thrown off 
by the plants, was more than what the evaporation would 
have been from a watery furface, of ten inches fquare. If 
this way of reafoning may be applied to fields covered with 
trees, grafs, and other vegetables, the inference will be, 
that the evaporation for feveral months is greater from 
them, than it is from equal areas of the furface of water. 
METEOROLOGICAL OBSERVATIONS made 
at BRADFORD 7 1772. 
THE inftruments ufed in the following obfervations, 
the times at which they were taken, and the method in 
which they are fet down, were defcribed in the paper fent 
to the Society laft year. With regard to thofe of the pre- 
fent year the following things are to be obferved: The 
hbarometrical obfervations till Nov. 6, muft be viewed as 
imperfedt, being taken with a barometer of too {mall a 
bore. From the 6th of November to the end of the year, 
they are very exact; being taken by a very good barome- 
ter made by Nazrne. In meafuring the quantity of eva- 
poration, I ufed a tube three inches diameter and fix deep ; 
which was filled once a week. The rain was meafured by 
a tube of the fame form and fize. In all other refpects, 
the fame method was obferved as in. the meteorological 
obfervations of 1771.. 
The obfervations taken by the barometer and thermomee. 
ter are fet down in three columns; the firft column con- 
tains the obfervations taken ufually about 6° a.m. the: 
fecond at noon, and the third at 9° p.m. The other co-. 
lumns give the general flate of the winds and weather of. 
the day. 
JANU- 
