318 
MR. GLAISHER ON THERMOJVIETRICAL OBSERVATIONS. 
Table VII. — Showing- the excess of the mean temperature in Spring, Summer,. 
Autumn and Winter, in every year, above the mean temperature for the period. 
1 Year . 
Spring . 
Summer . 
Autumn . 
Winter . 
Year . 
Spring . 
Summer . 
Autumn . 
Winter . 
0 
0 
0 
0 
0 
0 
0 
0 
1774 . 
+ 0-4 
4-0-7 
-1*7 
-2-0 
1811. 
+ 2-2 
-1-7 
+ 3-1 
+ 0*8 
1775 . 
+ 1-7 
4-1-2 
— 0-3 
— 2-4 
1812. 
-2-8 
— 3-8 
-0-9 
— 0-8 
1776 . 
+ 0-7 
-1-0-8 
+ 0-3 
— 1-2 
1813. 
— 3-4 
-2-5 
— 1-3 
— 5-4 
1777 . 
+ 0-5 
-0-2 
+ 1-8 
— 2-4 
1814. 
—2-6 
-2-3 
-1-7 
+ 0-2 
1778. 
- I -0-8 
-1-4-0 
— 1-3 
+ 3-1 
1815. 
+ 2-6 
-0-5 
+ 1-6 
— 1-1 
1779 . 
+ 4-3 
4-2-3 
+ 2-2 
— 3-1 
1816. 
-2-7 
-4-8 
+ 0-4 
+ 2-0 
1780. 
1781. 
+ 3-1 
+ 0-7 
- h 2-7 
+ S -7 
+ 0-3 
— 0-1 
1817. 
1818. 
I8I9 . 
-3-1 
-0-2 
+ 2-3 
— 2-6 
+ 4-3 
+ 0-7 
-0-2 
+ 5-2 
-0-5 
-0-4 
+ 1-8 
— 2-6 
1787. 
-0*3 
+ 0-2 
— 1-8 
+ 0-7 
1820. 
+ 1-0 
-1-9 
-1-7 
0-0 
1788. 
+ 1-6 
-0-3 
-0-8 
-3-7 
1821. 
+ 1-0 
—2-1 
+ 3-2 
+ 4*6 
1789. 
—2-6 
— 2-0 
— 2-6 
+ 2-6 
1822. 
+ 3-4 
+ 2-2 
+ 2-8 
3.4 
1790 . 
+ 0-9 
-1-4 
— 0-8 
+ 1-4 
1823. 
— 0-8 
-1-8 
— 0-6 
0-0 
1791 . 
- f -0-2 
— 0-5 
— 1-0 
— 2-1 
1824. 
— 2-3 
-0-8 
+ 2-0 
+ 1-6 
1792 . 
-1*3 
-1-6 
— 0-2 
+ 0-5 
1825. 
+ 0-4 
+ 2-0 
+ 1-5 
+ 0-4 
1793 . 
— 2-4 
— 0-2 
-0-1 
+ 1-8 
1826. 
+ 0-9 
+ 4-0 
+ 0-3 
-2-2 
1794 . 
+ 1-6 
- fO -8 
-0-9 
-6-2 
.1827. 
+ 1-0 
+ 0-1 
+ 1-1 
+ 3-5 
1795 . 
— 1-3 
— 2-2 
+ 2-4 
+ 5-4 
1828. 
+ 1-6 
+ 0-4 
+ 1-3 
+ 0-3 
1796 . 
-1-7 
-1-7 
-0-7 
-4-0 
1829. 
-0-8 
- I'O 
—2-6 
-4-6 
1797 . 
-1-9 
-0-9 
-1-6 
+ 0-7 
1830. 
+ 3-1 
-M 
+ 0-3 
-1-0 
1798. 
+ 1-3 
+ 1-5 
-0-5 
-0-7 
1831. 
+ 1-7 
+ 2-4 
+ 2-6 
+ 0-9 
1799 . 
-3*8 
-2-3 
— 1-1 
-3-2 
1832. 
-0-1 
+ 0-5 
+ 1-2 
+ 1-9 
1800. 
+ 0-1 
+ 0-7 
0-0 
+ 0-9 
1833. 
+ 0-9 
— 1-2 
— 0-8 
+ 5-2 
1801. 
- hl '2 
+ 0-5 
+ 0-6 
-1-9 
1834. 
+ 0-5 
+ 2-5 
+ 1-7 
+ 2-2 
1802. 
+ 0*1 
— 0-3 
—2-0 
0-0 
1835. 
+ 0-3 
+ 2-6 
+ 0-1 
-1-5 
1803, 
+ 0-2 
+ 0-6 
— 1-4 
+ 3-3 
1836. 
+ 0-1 
+ 0-3 
-1-9 
+ 1-2 
1804. 
+ 0-6 
+ 0-5 
+ 2-2 
-1-6 
1837. 
— 5-5 
-0-1 
-0-4 
— 3-5 
1805. 
-0-9 
— 1-5 
-0-4 
+ 2-7 
1838. 
-1-9 
— 0-8 
0-0 
+ 0-5 
1806. 
— 0-3 
+ 0-8 
+ 2-6 
+ 3-3 
1839. 
-3-2 
-0-7 
+ 0-4 
+ 1-0 
1807. 
-1-6 
+ 1-6 
-2-9 
-1-2 
1840. 
— 0-2 
-1-6 
— 1-2 
-3-5 
1808. 
-0*9 
+ 2-1 
-0-9 
-1-0 
1841. 
+ 3-5 
-1-8 
+ 0-7 
+ 0-3 
1809. 
1810. 
— 0*1 
-0-4 
— 1-3 
-3-7 
-0-9 
+ 2-1 
+ 0-1 
— 0-8 
1842. 
1843. 
+ 0-9 
+ 0-7 
+ 3-1 
4-2 
+ 2-0 
The sign — denotes that the mean temperature for that period was below the 
average, and the sign + denotes that it was above the average. 
It will be seen that hitherto the mean temperature at Somerset House has been 
estimated a great deal too high ; in almost every case the corrections have reduced 
the temperature. I have not in this paper discussed the question whether the tem- 
perature, as now determined, is too high for the latitude and elevation of Somerset 
House. This discussion will be necessary when I attempt to connect the series at 
Greenwich (which I look upon as merely a continuation of that taken at the Royal 
Society) with these results. I have already made some progress in this investiga- 
tion, and hope in a short time to present to the Society the results of my labours, 
and to give similar results to those in this paper brought up to the present time. At 
some future time I hope to be able to reduce the barometrical observations in a 
similar manner, the results from which will be of great value ; for although there has 
been neglect in stating at different times, what corrections have, and what have not 
been applied, yet I think they admit of the deduction of valuable results. 
