APPENDIX. 



MONTHLY EXTREMES OF THE ATMOSPHERIC PRESSURE. 



The only use which it is proposed to make of the barometric record is to exhibit the monthly 

 extreme values, together with their annual variation. Supposing the temperature of the room in 

 which the instrument was suspended to have remained above the freezing point, a reduction to it 

 was applied to the readings of the barometer by means of the indications of the external thermometer. 



Table XVIII contains the Monthly Extreme Readings of the Barometer (referred to | 











32° Fahr.) expressed in inches. 













January. 



February. 



March. 



April. 



May. 



.... j 



Year. 



Max. 



Min. 



Max. 



Miu. 



Max. 



Min. 



Max. 



Min. 



Max. 



Min. 



Max. 



Mitt. 



1807 



. . 



. _ 



. . 



. . 



. . 



. . 



. . 



. . 



. . 



- - 





. . 



1808 



30.4 



29.3 



30.5 



29.0 



30.5 



29.3 



30.4 



29.4 



30.2 



29.4 



30.2 



29.6 



1809 



.2 



28.9 



.4 



28.6 



.4 



.5 



.3 



.5 



.2 



.4 



.3 



.7 



1810 



.5 



29.2 



.3 



29.5 



.3 



.2 



.4 



.4 



.2 



.4 



.2 



.6 



1811 



.6 



.5 



.3 



.1 



.7 



.3 



.3 



.5 



.4 



.3 



.3 



.5 



1812 



.5 



.2 



.4 



.2 



.4 



.6 



.4 



.5 



.2 



.3 



.0 



.5 



1813 



.6 



.2 



.5 



.2 



.5 



.4 



.5 



.4 



.3 



.6 



.2 



.6 



1814 



.2 



28.9 



.5 



28.7 



.2 



.0 



.3 



.1 



.2 



.2 



.2 



'4 



1815 



.3 



29.0 



.5 



29.3 



.4 



.1 



.3 



.3 



.0 



.4 



.0 



A 



1816 



.5 



.2 



.4 



28.8 



.5 



.1 



.2 



.2 



.2 



.3 



.2 



.1 



1817 



.3 



28.9 



.2 



.6 



.4 



.4 



.3 



.3 



.3 



.5 



.2 



.1 



1818 



.4 



29.2 



.4 



29.2 



.6 



.4 



.0 



.0 



.1 



28.9 



.1 



.4 



1819 



.8 



.2 



.4 



28.9 



.3 



28.7 



.2 



.3 



.2 



29.1 



.1 



.4 



1820 



.2 



.3 



.5 



29.0 



.3 



29.0 



.3 



.2 



.1 



.2 



.0 



.5 



1821 



. . 



. . 



.4 



28.6 



.1 



28.7 



.4 



.1 



.0 



.3 



29.9 



.3 



1822 



.3 



28.8 



.4 



29.0 



.4 



29.2 



.2 



.1 



.1 



.2 



30.2 



.3 



1823 



.6 



29.0 



.4 



28.9 



.5 



.1 



.8 



- - 



.5 



.2 



.2 



.2 



1824 



.4 



.0 



.6 



29.2 



.7 



.5 



.1 



.3 



.2 



28.9 



.2 



.2 



1825 



.5 



.3 



.5 



.3 



.2 



.3 



.4 



.3 



.2 



29.5 



29.9 



.4 



1826 



.3 



.1 



.5 



.0 



.6 



.4 



.5 



.4 



.2 



.4 



30.1 



.4 



1827 



.3 



28.8 



.6 



.0 



.5 



.0 



.4 



.0 



.2 



.3 



.2 



.5 



1828 



.5 



29.3 



.5 



.2 



.5 



_2 



. - 



.6 



.4 



.3 



.3 



.5 



1829 



.5 



.3 



.2 



28.8 



.2 



!2 



.3 



.3 



.4 



.5 



.3 



28.9 



1830 



.5 



.4 



.6 



29.3 



.6 



.0 



.4 



- - 



.3 



6 



.1 



29.3 



1831 



.3 



.2 



.6 



.0 



.3 



.0 



.1 



28.9 



.3 



.2 



.2 



.6 



1832 



.6 



.0 



.6 



.6 



.4 



.3 



.2 



29.4 



.5 



.2 



.1 



.5 



1833 



.5 



.1 



.2 



.2 



.5 



.4 



.4 



.4 



.3 



.5 



.1 



.3 



1834 



.5 



.1 



.5 



.5 



.4 



.6 



.7 



.3 



.3 



.5 



.1 



.3 



1835 



.4 



.1 



.6 



.4 



.6 



.1 



.2 



.3 



.3 



.4 



.3 



.3 



1836 



.4 



.3 



.4 



.0 



.3 



.3 



.4 



.3 



.7 



.4 



.2 



.6 



1837 



.0 



.0 



.2 



28.7 



.9 



.3 



.1 



.0 



.2 



.4 



.1 



.4 



1838 



.4 



.1 



.1 



29.3 



.4 



.3 



.1 



.3 



.0 



.5 



.2 



.4 



1839 



.8 



.1 



.3 



.4 



.5 



.2 



.3 



.2 



.2 



.3 



.0 



.4 



1840 



.3 



.0 



.5 



.4 



.2 



.2 



.5 



.3 



.3 



.3 



.1 



.4 



1841 



.7 



.2 



.1 



.2 



.4 



.0 



.4 



28.9 



.1 



.0 



.1 



.5 



1842 



.4 



.1 



.5 



28.7 



.2 



.4 



.2 



29.3 



.2 



.4 



.4 



.6 



1843 



.6 



.0 



.4 



29.2 



.2 



.0 



.2 



.2 



.3 



.5 



.2 



.4 



1844 



.3 



28.9 



.2 



.4 



.4 



.2 



.7 



.7 



.2 



.3 



.2 



.6 



1845 



.4 



29.3 



.5 



.0 



.3 



.2 



.3 



.3 



.4 



.5 



.0 



.5 



1846 



.4 



.3 



.3 



.2 



.3 



.3 



.5 



.4 



.1 



.2 



.3 



.5 



1847 



.4 



28.6 



.4 



.0 



.4 



28.7 



.3 



.4 



.1 



.5 



.1 



.2 



1848 



.5 



29.0 



.3 



28.9 



.2 



29.4 



.5 



.3 



.1 



.1 



29.9 



.4 



1849 



.5 



.3 



.7 



29.3 



.9 



.4 



.4 



.3 



.4 



.4 



30.2 



.5 



1850 



.5 



.2 



.5 



.0 



.2 



.1 



.1 



.1 



.2 



.3 



.2 



.6 



1851 



.5 



28.8 



.8 



.3 



.4 



.3 



.4 



.4 



.2 



.3 



.2 



.5 



1852 



.4 



29.1 



.5 



.2 



.5 



.1 



.0 



.0 



.2 



.5 



.2 



.3 



1853 



- . 



. . 



. . 



. . 



- - 



. . 



. . 





- . 



- - 



- - 



- - 



1854 



.5 



.3 



.7 



.2 



.3 



.0 



.5 



.5 



.2 



.4 



.0 



.5 



18fi5 



- - 



. . 



.3 



.4 



.1 



.3 



.7 



.4 



.1 



.5 



.0 



.2 



1856 



.5 



.4 



.2 



28.8 



.1 



.1 



.3 



.5 



.2 



.3 



.3 



.5 



1857 



.5 



.2 



.8 



29.4 



.3 



.3 



.3 



.1 



.3 



.5 



29.9 



.3 



1858 



.7 



A 



.3 



.3 



A 



.1 



.2 



.4 



.3 



.3 



30.0 



.6 



1859 



. .6 



A 



.7 





A 



.4 



.1 



.3 



.2 



.5 



.3 



.3 



Means, 



30.45 





30.43 





30.40 





30.33 





30.23 





30.14 







29.11 





29.11 





29.21 





29.28 





29.34 





29.41 



(51) 



