THERMOMETER, AND RAIN. 567 
corroborated, although the annual mean, and also 
the mean of each month, except November, are 
higher than in the table, page 487 of the volume 
before mentioned. 
The mean annual height of the Barometer for a 
series of years, does not differ much from the mean 
for any particular year. On looking over the 
annual means for the last forty-seven years, I find 
the lowest to have been in 1799 and 1800, both of 
which were 29.61 inches. These two years will 
long be remembered as the most unfavourable 
seasons for the produce of the earth that have 
occurred for half a century at least. The former 
of these was the coldest for the series of forty- 
seven years; and eighteen inches of rain fell in 
the three most important months of the year, viz. 
July, August, and September. The highest 
annual mean was in 1826, viz., 30.04 inches. This 
was one of three or four of the warmest in the 
above period of years. The greatest difference, 
therefore, between one year and another, appears 
to be .47 parts of an inch in this part of the 
earth, or parallel of latitude. There does not 
appear, however, to be a marked connexion 
between the annual pressure and temperature of 
the atmosphere, nor yet with the amount of rain. 
