280 Sir G. B. Airy. On the [Nov. 23 y 



Table I. — Monthly Mean Temperature of the Water of the Thames at 



Greenwich. 





Month. 







Year 



J anuary. 



February. 



March. 



April. 



May. 



June. 



July. 



August. 



September. 



October. 



November. 



December. 



Sums. 



1 Means. 





o 





















































1844 































1845 



39-3 



34-4 



38-8 



49-6 



52-9 



630 



63-6 



60-1 



56-8 



50-9 



46-1 



40-6 



*<q6*i 



49*7 



1846 



43-3 



43-9 



47-4 



50*9 



60-4 



73-1 



67-1 



67-1 



65-9 



5i-9 



44-4 



36*9 



U J* 



54*4 



1847 



36-5 



38-2 



42-9 



47-1 



59*4 



63-2 



68-9 



64-6 



56-2 



52-8 



46-5 



41-4 



6l f 7* l 7 



51*5 



1848 



35-5 



42-7 



46*3 



51-7 



64-2 



63-1 



65-5 



62-1 



59-4 



52-3 



42*9 



41-0 



626'7 



52*2 



1849 



41-8 



43-5 



45-2 



47-9 



58-2 



64-1 



67-5 



63-9 



59-3 



50-1 



44-8 



373 



623*6 



52*0 



1850 



33-0 



41-6 



41-5 



49-4 



54-0 



63-8 



64-8 



63-3 



57-5 



48-4 



46-3 



39-6 



603 '2 



50*3 



1851 



41-0 



40-1 



42-8 



49-7 



54-3 



61-9 



65-0 



65-7 



58'9 



54-6 



41-3 



41-5 



6i6 - 8 



51*4 



1852 



40-9 



41-0 



42*2 



48-3 



55-5 



61*2 



70-6 



66-2 



60-1 



48-6 



46-7 



46-3 



627*6 



52*3 



1853 



40-0 



37-1 



42-4 



48-6 



55-5 



62-6 



63-4 



62-3 



58-i 



53-5 



43'5 



38-0 



605-0 



50*4 



1854 



39-1 



41-3 



46-2 



52-1 



56-1 



59-4 



64-8 



63-8 



62-9 



53-6 



44-7 



41-8 



625*8 



52*1 



1855 



39-9 



34-6 



41-4 



49-1 



53-2 



59-7 



66-4 



66-1 



60-9 



54-1 



44-2 



38-5 



608 * 1 



50*7 



1856 



40-5 



42-4 



43-5 



50-7 



54-0 



63-0 



65-4 



66-6 



58-2 



54-5 



44-1 



42-6 





52*1 



1857 































1858 



39-2 



37-8 



41-7 



50-0 



56-5 



67-9 



65-1 



65-4 



62-1 



56-7 



42-1 



41-9 



626*4 



52*2 



1859 



41-4 



44-8 



47-9 



49-7 



55-3 



65-4 



71-1 



67-2 



61-2 



60-2 



44-7 



38-8 



647*7 



54*0 



1860 



40-8 



36-9 



42-9 



47-0 



56-9 



58-8 



62-5 



60-8 



57-6 



51-1 



45-3 



39-8 



600*4 



50*0 



1861 



35-0 



43-1 



44-9 



49-4 



56-5 



63-4 



65-3 



65-7 



61-1 



57-0 



43-7 



41-4 



626*5 



52*2 



1862 



39-7 



43-4 



46-4 



51-0 



58-3 



60-2 



62-5 



63-4 



60-0 



54-7 



43-6 



42-7 



625 'Q 



52*2 



1863 



41-2 



43-2 



45-6 



53-1 



56-5 



63-1 



66-2 



65-3 



60-2 



54-8 



48-1 



43-5 



640*8 



53*4 



1864 



39-8 



37-5 



43-7 



50-5 



58-8 



61-7 



66-0 



63-2 



60-5 



52-9 



44-4 



42-5 



621*5 



51*8 



1865 



38-5 



38-2 



39-6 



53-9 



60-6 



65-7 



65-7 



64-3 



65-9 



54-0 



43-9 



43-1 



633-4 



52*8 



1866 



42*2 



39"3 



41*8 



50*6 



53"7 



62'9 



65'2 



61*5 



58'2 



53'7 



44-7 



41'5 



615*3 



51*3 



1867 



35-1 



44-2 



40-5 



49-9 



55-2 



62-0 



62-7 



63-7 



59-6 



49-7 



43-5 



36-8 



602 '9 



50*2 



1868 



37'6 



41'5 



45 "9 



50'0 



59"6 



64'5 



68'3 



65 "1 



60'2 



50'4 



43'3 



43'8 



630*2 



52*5 



1869 



41-6 



44-4 



40-4 



51-1 



53-9 



57-2 



65-1 



62-4 



57-9 



511 



42-8 



37-9 



605*8 



50*5 



1870 































1871 



35*9 



41-8 



45-6 



49-6 



55-1 



58-8 



63-8 



66-6 



61-1 



51-9 



41-3 



37-7 



609*2 



50*8 



1872 



40-2 



44-5 



47'0 



51-7 



54-7 



62-6 



68-1 



65-1 



60-5 



50-3 



45-8 



42-0 



632-5 



52*7 



1873 



41-9 



36-6 



43-5 



49-2 



53-9 



61-3 



66-4 



65-1 



57-7 



52-7 



44-4 



42-4 



615*1 



51*3 



1874 



41-1 



40-3 



44-3 



51-3 



56-1 



62-7 



67-5 



63-0 



60-0 



54-4 



49-3 



34-4 



624*4 



52*0 



1875 



41-2 



38-1 



43-1 



48-9 



59-0 



62-8 



62-7 



66-1 



63-2 



51-2 



42-5 



38-9 



617*7 



51*5 



1S76 



39-4 



42-1 



42-2 



50-1 



54-1 



61-9 



67-9 



66-9 



59-2 



55-5 



46-0 



43-2 



628*5 



52*4 



1877 



42-9 



44-3 



42*6 



49-2 



53-5 



64-0 



65-0 



65-8 



57-8 



51-6 



47-1 



41-4 



625*2 



52-1 



1878 



41-1 



42-5 



45-4 



51-0 



59-4 



62-5 



67-7 



66-1 



60-2 



54-7 



42-2 



36-5 



629*3 



52*4 



1879 



33-9 



38-8 



43-3 



47-2 



52-3 



59-8 



60-7 



C2-3 



58-2 



53-0 



39-3 



35-9 



584-7 



48*7 



Sums 



1300-5 



I344-I 



1438-9 



1649-5 



1857-6 



2067-3 



3168-5 



3U6-8 



1976-6 



1746-9 



I463-5 



I33I-6 



20471*8 





Means 



39-4 



40-7 



43-6 



50-0 



56-3 



62-6 



65-7 



64*4 



59-9 



52-9 



44-3 



40-4 





51*7 



During the years 1844, 1857, and 1870 the observations were incomplete, the results for those 

 years have in consequence been altogether omitted. The monthly values in different figures are esti- 

 mations, inserted in order to complete the numbers for the particular years in which they occur, for 

 the purpose of taking means. 



