316 
MR. GLAISHER ON THE THERMOMETRICAL OBSERVATIONS 
begin in March, so that every year may consist of one summer and one entire winter, 
and not of parts of two winters with the summer intervening, therefore — 
Spring includes the months of March, April and May ; 
Summer includes the months of June, July and August ; 
Autumn includes the months of September, October and November ; 
Winter includes the months of December, January and February ; 
so that winter consists of the last month of one civil year, and the first two months 
of the following year. 
Table VI. — Showing the mean temperature in Spring, Summer, Autumn and 
Winter, and the same for successive groups of years. 
Spring. 
Summer. 
Autumn. | 
M'inter. 
Year. 
March, 
April, 
May. 
Group 
of years, 
June, 
July, 
August. 
Group 
of years. 
September, 
October, 
November. 
Group 
of years. 
December, 
January, 
Februaiy. 
Group 
of years. 
1774 . 
48-0 
“*v 
0 
61-7 
-1 
0 * 
48-8 
41-3 
0 
1775 . 
49-3 
63-2 
50-2 
36-9 
1776 . 
48*3 
6l-8 
50-8 
38-1 
1777- 
1778. 
48-1 
48*4 
>49-1 
60-8 
65-0 
>63-0 
52-3 
49-3 
^507 
36-9 
42-4 
^387 
1779 . 
51-9 
63-3 
52-7 
36-2 
1780. 
50-7 
63*7 
50-8 
39-2 
1781. 
48*3 
-- 
64-7 
J 
1787. 
47*3 
61-2 
48*7 
40-0 
1788. 
49*2 
60-7 
49-7 
35-6 
1789. 
45-0 
59-0 
47.9 
41-9 
1790 . 
46-7 
59*6 
497 
407 
1791 . 
1792 . 
47-8 
46-3 
>46-9 
60-5 
59-4 
> 60'1 
49- 5 
50- 3 
^49-9 
37*2 
39-8 
>38-9 
1793 . 
45-2 
60-8 
50-4 
4M 
1794 . 
49-2 
61-8 
49-6 
33-1 
1795 . 
46-3 
58-8 
52-9 
447 
1796 . 
45-9 
J 
59-3 
49-8 
J 
35-3 
J 
1797. 
45-7 
1 
60-1 
48-9 
40-0 
1798. 
48-9 
62-3 
50-0 
38-6 
1799. 
43-8 
58-7 
49-4 
36-1 
1800. 
47-7 
61-7 
50-5 
40-2 
1801. 
1802. 
48-8 
47-7 
>47-3 
61-5 
60-7 
>60-9 
51-1 
48-5 
>50-3 
37-4 
37-3 
>39-5 
1803. 
47-8 
61-6 
49-1 
42-6 
1804. 
48-2 
61-5 
52-7 
377 
1805. 
46-7 
59-5 
50-1 
42*0 
1806. 
47-3 
61-8 
53-1 
J 
42-6 
1807. 
46-0 
62-6 
- 
47-6 
38-1 
1808. 
46-7 
63-1 
49-6 
38-3 
I8O9. 
47*5 
59*7 
49-6 
39-4 
1810. 
47'2 
57-3 
52-6 
38-5 
1811. 
1812. 
49-8 
44-8 
>46’6 
59-3 
57-2 
>59-4 
1 
53-6 
49-6 
>50-4 
40-1 
38-5 
>38-6 
1813. 
44-2 
58-5 
49-2 
33-9 
1814. 
45-0 
58-7 
48-8 
39-5 
1815. 
50-2 
60-5 
52-1 
38-2 
1816. 
44-9 
56*2 
- 
50-9 
41-3 
