THE ROYAL SOCIETY, AND AT THE ROYAL OBSERVATORY, GREENWICH. 573 
same circumstances as those at Lyndon at the beginning of that series, with the view 
of determining whether an agreement exists in the differences at those different 
epochs, and also for the purpose of assisting to determine whether London be really 
warmer than the country, as affirmed. The observations which most fully satisfy these 
conditions are those made by Mr. Thomas Squire of Epping. This gentleman, on 
my request to furnish me with the monthly means of his observations for comparison 
with those of this Society, most promptly and obligingly sent me the monthly mean 
from twenty-eight years’ observations taken on every day at S'' in the morning. 
The thermometer witli which the observations were made was placed in the shade, 
at the height of 5 feet above the ground, facing the N.E., and an open country. 
These numbers I have reduced to mean values by the application of corrections, 
for that purpose (see ray paper in Philosophical Transactions, Part I. 1848) then I 
further reduced them to the elevation at Somerset House and for difference of lati- 
tude, and in this way the next Table was formed. 
Table XL — Mean monthly temperature of the Air at Epping reduced to the eleva- 
tion and latitude of Somerset House, for the year 1821 to 1848. 
Year. 
January. 
Feb. 
March. 
April. 
May. 
June. 
Jul}’. 
August. 
Sept. 
October. 
Nov. 
Dec. 
Year. 
1821. 
38-5 
34-8 
43-0 
50-2 
49-4 
53-1 
58-4 
64-1 
62-7 
50-7 
O 
47-3 
43-5 
49-6 
1822. 
39^0 
43-0 
46-9 
48-9 
57-6 
65-3 
64*1 
62-7 
58-1 
52-6 
46-6 
33-9 
51 •6 
1823. 
31-5 
38*3 
41-5 
47-1 
57-1 
56*8 
60-3 
61-5 
57-1 
48-4 
43-8 
39-6 
48*6 
1824. 
38-0 
38*8 
41-6 
46'2 
52*1 
56-8 
62-9 
61-9 
59-9 
51-0 
46-7 
42-2 
49-8 
1825. 
38-9 
38-2 
41-7 
51*0 
56-7 
60*6 
65*4 
64-3 
62-6 
51-8 
41-0 
40-2 
51-0 
1826. 
31-8 
42-3 
43-4 
50*6 
53*1 
63-9 
66-3 
66-1 
59*8 
53-7 
40-2 
42-7 
51-2 
1827. 
33-8 
32-3 
44-9 
50‘6 
56-0 
59-8 
64-2 
61-3 
59-2 
53-8 
42-5 
41*2 
50*2 
1828. 
40-7 
41-8 
44-7 
49-8 
57*0 
61-9 
62-8 
6 l '5 
60-1 
50*7 
44-8 
45-2 
51-8 
1829. 
31-9 
38-8 
40-3 
46-0 
56*7 
60*5 
60-8 
58-9 
54-4 
49-0 
38-9 
32-4 
47-3 
1830. 
31*4 
34-4 
46-4 
50-7 
56-8 
36*2 
63-9 
59*1 
55-2 
52-1 
43-1 
35-3 
48-7 
1831. 
34-9 
41-2 
45-5 
51-3 
54-7 
60-3 
62-1 
63-8 
58-2 
56-2 
42-7 
42*3 
50-2 
1832. 
36-8 
37-0 
41-8 
48-9 
53-4 
59-8 
6 M 
61-8 
58-3 
52-2 
53-6 
43*1 
50-3 
1833. 
35-2 
42*9 
38-9 
47-9 
60-4 
59-8 
60-7 
57-9 
55-0 
51-6 
43-1 
45-8 
49-9 
1834. 
45-6 
40-1 
45-1 
47*6 
57-7 
61-5 
64-0 
63-2 
60-5 
51-9 
44-4 
41-3 
51-9 
1835. 
38-6 
41-4 
42*3 
48-8 
54-7 
60-7 
64-2 
64-5 
58-9 
48-8 
43-7 
35-7 
50*2 
1836. 
37-9 
37*0 
44-5 
46-1 
52-6 
61-0 
62-6 
60-3 
55-6 
49-7 
42-1 
40-4 
49-2 
1837. 
38*4 
40*1 
37*4 
42-4 
50-4 
60-7 
62*5 
62-3 
57-6 
51-5 
39*5 
41-9 
48-7 
1838. 
28-6 
32-9 
42-5 
44-8 
53-7 
60-2 
62-4 
62-1 
57*5 
5 M 
40-4 
38-7 
47-9 
1839. 
37-2 
39-0 
41-3 
45*1 
51-3 
61*7 
62*6 
61*0 
57'7 
50-7 
46-3 
40»1 
49-5 
1840. 
39*2 
38-0 
39-4 
50*1 
56-4 
62*1 
61-0 
64-2 
54-2 
46*4 
42-6 
32-6 
48-9 
1841. 
33-6 
36-3 
46-5 
48-8 
59-1 
58-1 
60-9 
62'6 
60-2 
49-8 
42-2 
40-0 
49-8 
1842. 
33-1 
40'1 
44-8 
47-3 
55-1 
64-7 
62-4 
67-3 
59-4 
44*9 
42*4 
44-1 
50-4 
1843. 
39-6 
35-9 
43-1 
49-5 
54-5 
58-0 
62‘6 
64-5 
62-1 
48*0 
43-1 
44-1 
50-4 
1844. 
38-5 
33-9 
42-3 
51-8 
54-4 
62-0 
63-6 
59-4 
59-2 
47-9 
43-5 
33-9 
49-3 
1845. 
38-9 
32-2 
36-8 
47-7 
51-2 
62-8 
61-6 
59-3 
56*5 
50-1 
44-6 
40-0 
48-5 
1846. 
42-7 
42-2 
43-9 
48-4 
56-1 
67*3 
65’4 
64’5 
60-6 
50-5 
44-4 
31-2 
51-5 
1847. 
35-0 
35-0 
40*8 
45-4 
57-0 
58-3 
64-9 
61-7 
54*2 
52-8 
45-3 
41-8 
49-4 
1848. 
35-0 
42-6 
43-0 
48*9 
59-4 
60*1 
62-5 
59-3 
56-6 
51*7 
40-5 
41-9 
1 
50-2 
