MADE AT THE APARTMENTS OF THE ROYAL SOCIETY. 
311 
Table II. — Showing the mean temperature of the Air in each month in successive 
groups of years. 
Period. 
January. 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September. 
October. 
November. 
December. 
0 
o 
From 1774 to 1781 
35-0 
40-4 
451 
48-0 
54-4 
607 
64-4 
63-8 
581 
510 
430 
40-2 
From 1787 to 1796 
37-5 
40-8 
41-5 
47-3 
527 
57-2 
61-6 
617 
56-8 
50-2 
42-5 
39-1 
From 1797 to 1806 
38-4 
38-9 
41-6 
46-9 
53-4 
58-4 
61-9 
627 
57-8 
49'9 
43-3 
39-9 
From 1807 to 1816 
35-4 
40-1 
41-4 
45-8 
52-8 
57-2 
61-2 
60-8 
57-6 
51-4 
42'3 
40-2 
From 1817 to 1826 
38-6 
40-3 
430 
47-9 
531 
59-2 
627 
62-2 
58-5 
50-9 
457 
411 
From 1827 to 1836 
377 
397 
43-3 
47-2 
54-8 
59-9 
63-6 
61-3 
56 7 
51 -4 
44-2 
41-5 
From 1837 to 1843 
377 
38-9 
421 
45- 1 
531 
58-2 
60-9 
62-3 
56-6 
49-9 
44-6 
40-9 
The mean temperature of January from all the observations is . 
The mean temperature of February from all the observations is 
The mean temperature of March from all the observations is . 
The mean temperature of April from all the observations is 
The mean temperature of May from all the observations is . . 
The mean temperature of June from all the observations is. . 
The mean temperature of July from all the observations is . . 
The mean temperature of August from all the observations is . 
The mean temperature of September from all the observations is 
The mean temperature of October from all the observations is 
The mean temperature of November from all the observations is 
The mean temperature of December from all the observations is 
The mean of all the monthly results is 
37-2 
40-1 
42-5 
46-9 
53-5 
587 
62-4 
62-1 
57*5 
507 
44-0 
40-4 
497 
I shall not attempt to enter into the discussion of periods of less or greater heat, 
as such can be very readily seen in the following Table, which is formed by taking 
the difference between the mean temperature of the month derived from all the ob- 
servations, and the mean temperature of the same month in every year, as contained 
in Table I. 
2 s 2 
I 
