568 OBSERVATIONS ON THE BAROMETER, 
It appears from the tables for the last forty- 
seven years, that the highest monthly mean height 
of the Barometer for a year, may occur in any 
one of the twelve months, but not indifferently. 
Thus I found the highest mean to occur six times ; 
in January, three times in February, five times in 
March, three times in April, three in May, four 
in June, five in July, seven in August, four in 
September, one in October, two in November, 
and four in December. 
The above observation does not apply to the 
lowest monthly mean for any year :—for I found 
nine in January, six in February, five in March, 
three in April, one in June, one in September, 
six in October, ten in November, and six in 
December ; none were found in May, July, or 
August—so that from March to October the 
lowest mean has occurred only five times, whilst 
from September to April it has occurred forty-two 
times in forty-seven years. 
In this period of forty-seven years’ observations 
the fact of greater variation of the Barometer in 
winter than in summer, may be supposed to have 
been sufficiently substantiated. On inspecting 
each year of the Journal, and marking those 
