592 MR. GLAISHER ON THE THERMOMETRICAL OBSERVATIONS TAKEN AT 
Table XXII. (Continued.) 
Year. 
January, 
February, 
March. 
Group of 
years. 
April, 
May, 
June. 
Group of 
years. 
1 July, 
August, 
September. 
Group of 
years. 
October, 
j November, 
j December. 
Group of 
years. 
For the 
year. 
Group of 
years. 
1820 . 
- 1-6 
•>1 “ 
+ 0°-4 
o 
O 
- 1-9 
0 
- 0-6 
o 
O 
- 0-9 
o 
1821 . 
4 - 0-5 
— 0-8 
+ 0-3 
+ 4-0 
+ 1-0 
1822 . 
4 - 5-3 
+ 2-9 
+ 0-5 
+ 2-1 
+ 2-7 
1823 . 
- 1*7 
- 1-2 
- 1-3 
+ 0-1 
— 1-0 
1824 . 
1825 . 
- 0-5 
0-0 
> + 0-2 
— 2-7 
+ 1-6 
> + 0-4 
+ 0-7 
+ 2-9 
> + 0-2 
! + 2-5 
! + 0-8 
>+ 1-3 
0-0 
+ 1-3 
> + 0-5 
1826 . 
- fO -9 
4 1-9 
+ 2-4 
i + 1-3 
+ 1-6 
1827 . 
— 2-3 
+ 0-3 
+ 0-4 
j + 2-4 
+ 0-2 
1828 . 
4 - 3-0 
+ 1-5 
+ 0-1 
+ 2-8 
+ 1-8 
1829 . 
- 1-9 
) 
+ 0-3 
J 
— 2-4 
— 2-8 
- 1-7 
1830 . 
- 1-3 
■N 
+ 0-7 
■s 
- 1-2 
0-0 
— 0-5 
1831 . 
+ 1-5 
+ 1-3 
+ 1'9 
! + 3-7 
+ 2-1 
1832 . 
0-0 
+ 0-5 
+ 0-2 
+ 2-4 
+ 0-8 
1833 . 
- 0-1 
+ 2-7 
— 2-0 
i + 2-1 
+ 0-7 
1834 . 
1835 . 
+ 4-7 
+ 1-8 
^ + 0-4 
+ 2-2 
+ 1-0 
> 0-0 
+ 2-2 
+ 2-2 
>- 0-1 
+ 1-8 
; - 1-4 
>+ 1-0 
+ 2-7 
+ 0-9 
> + 0-3 
1836 . 
+ M 
- 0-4 
- 1-0 
^ - 0-6 
— 0-2 
1837 . 
- 0-5 
- 3-8 
- 0-6 
+ 0-9 
- 1-0 
1838 . 
- 3-8 
— 2-3 
— 1-2 
- 0-3 
- 1-9 
1839 . 
+ 0-1 
J 
- 2-3 
J 
- 1-2 
, + 1-0 
-- 
- 0-6 
1840 . 
0-0 ■ 
\ 
+ 1-5 
- 1-3 
— 2-2 
- 0-5 
1841 . 
+ 0-1 
+ 1-4 
- 0-6 
i + 0-6 
+ 0-4 
1842 . 
+ 1-3 
+ 1-7 
+ 1-3 
+ 1-0 
+ 1-3 
1843 . 
+ 1-3 
— 0-2 
+ 1-4 
+ 1-8 
+ 1-1 
1844 . 
1845 . 
+ 0-4 
- 2-9 
> + 1-0 
+ 3-0 
0-0 
j > 4 - l *5 
- 0-7 
— 2-5 
> + 0-3 
- 1-2 
+ 2-5 
> + 1-0 
+ 0-4 
- 0-7 
^+ 1-0 
1846 . 
+ 6-4 
+ 3-6 
+ 3-2 
- 0-3 
+ 3-0 
1847 . 
— 1-1 
+ 1*1 
+ 1-2 
+ 4-1 
+ 1-3 
1848 . 
+ 2-3 
+ 3-2 
- 0-8 
+ 3-1 
+ 1-9 
1849 . 
+ 3-6 
- 0-4 
/ 
+ 1-9 
+ 1-4 
+ 1-6 
The sign — denotes that the temperature of that period was below the average, 
and the sign + denotes that it was above the average. 
These numbers do not at all confirm the idea that a hot summer is either preceded 
or followed by a cold winter, or vice versa ; on the contrary, it would seem that any 
hot or cold period has been mostly accompanied by weather of the same character. 
The cold year of 1771 was followed by two cold years. The hot year of 1779 was 
preceded by one warm year and followed by two others. In 1780 the extreme cold 
of January was more than counterbalanced by the extreme heat of March. The cold 
year of 1782 was followed by a long series of cold years. The very cold year of 1799 
was followed by a cold autumn and winter. The warm year of 1806 was preceded 
by a warm winter. The very cold year of 1814 (the last very cold year we have had) 
was preceded by a cold summer, autumn and winter. The hot year of 1818 was pre- 
ceded by a moderate winter, and was followed by a warm one. The hot year of 1822 
was preceded by a warm winter and was followed by a moderately cold one. The 
hot year of 1834 followed a very mild winter and was followed by another. The hot 
