THERMOMETER, AND RAIN. 565 
The same Barometer has been used during the 
last twenty-two years as was in use the fifteen 
preceding years. It stands nearly 1-10th of an 
inch higher than other good Barometers do in the 
same situation, probably from some difference in 
the mercury. I find the allowance I have made in 
the scale for the rise and fall of the mercury in 
the reservoir is rather too small; consequently, 
the extreme elevations and depressions are not 
quite so great as they ought to be, but the influ- 
ence of this circumstance upon the-averages is 
scarcely worth notice. 
Now, if we incorporate the means of the Baro- 
meter for twenty-two years, as above stated, with 
those of the former period of twenty-five years 
previously published, (see Vol. III. page 487,) 
so as to obtain general averages or means for 
both periods, amounting to forty-seven years, we 
shall obtain the following means for the different 
months, and the mean annual height of the Baro- 
meter for the whole period. 
