Relative Humidity. 



273 



The periods of maxima for the four meteorological seasons are as follow :- 



Makerstoun mean time. 



Spring, 



Ih 



lO'" P.M. 



Summer, 



1*^ 



0™ P.M. 



Autumn, 



Oh 



45™ P.M. 



Winter, 



11^ 



30™ P.M. 



The Year, 



11^ 



0"" P.M. 



A secondary minimum occurs in Summer at 3*^ 40™ p.m., and a secondary maximum about 5^ p.m. There 

 is a marked inflection in the curve for Autumn at 3*^ 1 0™ p.m. In the mean for the whole year, the secondary 

 minimum probably occurs about 4^* p.m., the secondary maximum about 5^ p.m. 



The pei'iods of maxima and minima for the four astronomical seasons are — 



Spring, principal max., I'' 40™ p.m. 



Summer, 1^ 20™ p.m. Secondary min,, 4^^ 10™ p.m. Secondary max., S'^ 0™ p.m. 



Autumn, 0^ 0™ Noon. 31^ 40™ p.m. 5"^ 10™ p.m. 



Winter, l^^ 10™ p.m. 



The mean pressure of aqueous vapour for the year occurs at 8^ 10™ a.m. 

 8** 10™ P.M. 



The interval between the periods is, . . . . 12'' 0™. 



Ra7ige of the Diurnal Variation of the Pressure of Aqueous Vapour. — The range is inexact for the sum- 

 mer months ; it is here, however, as evident, as in the previous cases of temperature, that the range is less in 

 the summer months than in the months immediately preceding and succeeding. The greatest range is that for 

 September, being about 0-100 inch. 



TABLE XII.— Mean Relative Humidity for each Civil Day, Week, and Month of 1843, 



Saturation being = 1. 



Civil 

 Day. 



.Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



1 



[ ] 



0-819 



0-835 



0-880 



0-772 



0-973 



0^792 



0-884 



0-893 



[0-825] 



0-946 



0-965 



2 



0-766 



•803 



•819 



[ -854] 



•850 



-944 



r -7791 



•861 



-874 



•763 



•971 



-937 



3 



•914 



•922 



•769 



•795 



•829 



-883 



•775 



•847 



[ -821] 



•842 



•987 



[ -890] 



4 



•749 



•801 



•844 



•891 



•753 



[ -891] 



•709 



•867 



•714 



-848 



•860 



-889 



5 



•718 



[ -884] 



[ -831] 



•827 



•726 



-872 



•935 



•759 



•790 



•821 



[ -882] 



-820 



6 



•894 



-868 



•881 



•851 



•765 



•875 



•815 



[ .851] 



•841 



•876 



•841 



•759 



7 



•843 



•923 



•827 



•845 



[ ^786] 



-797 



•812 



•894 



•779 



•831 



-856 



•859 



8 



C •847] 



•985 



-849 



-841 



•821 



•778 



•857 



•952 



•790 



[ ^899] 



•776 



•798 



9 



•911 



•852 



-848 



[ -788] 



•822 



•811 



[ •814] 



•790 



•804 



-911 



-849 



•956 



10 



•859 



-798 



-929 



-698 



-831 



•745 



•770 



•802 



[ ^857] 



•975 



•992 



[ ^883] 



11 



•857 



•753 



•918 



-716 



-784 



[ -827] 



•742 



•854 



•956 



•978 



•927 



•896 



12 



•928 



[ -828] 



[ ^861] 



•776 



-807 



•848 



•887 



•880 



•946 



•774 



[ ^920] 



•906 



13 



•935 



•869 



•792 



-733 



-877 



•920 



•864 



[ ^870] 



-867 



•784 



-931 



•884 



14 



•796 



•854 



•831 



•754 



[ -852] 



•859 



-814 



•812 



•881 



•807 



-895 



-836 



15 



[ •883] 



•845 



•847 



-801 



•893 



•733 



•758 



•939 



•878 



[ ^828] 



-929 



-823 



16 



•814 



•877 



•896 



[ -765] 



•939 



•697 



[ -835] 



•935 



•865 



-819 



-902 



•828 



17 



•898 



•917 



•896 



-768 



•814 



•818 



•879 



•926 



[ ^877] 



•912 



•881 



[ -864] 



18 



•930 



•870 



•887 



-778 



•786 



[ ^764] 



•844 



•839 



•895 



•874 



•900 



-931 



19 



•930 



[ •sgs] 



[ -881] 



-758 



•731 



•863 



-854 



•804 



•859 



•831 



[ ^898] 



-878 



20 



•915 



•749 



•892 



•802 



•772 



•731 



•864 



[ ^842] 



•883 



•872 



• 918 



■887 



21 



•888 



-969 



•896 



•779 



[ ^865] 



•744 



•769 



•787 



•798 



•839 



•951 



•952 



22 



[ -894] 



•979 



•817 



•913 



•974 



•676 



•892 



•890 



•860 



[ -844] 



•839 



•856 



23 



•900 



-970 



•881 



[ -801] 



•991 



•768 



[ ^825] 



•808 



•856 



•787 



•978 



-871 



24 



•873 



-933 



-922 



■739 



•939 



•791 



•710 



• 809 



[ -791] 



-872 



•964 



[ -899] 



25 



•861 



-907 



-814 



•784 



•935 



[ -755] 



-826 



•811 



•822 



•863 



•974 



-904 



26 



•827 



[ -890] 



[ -845] 



•787 



•913 



•797 



-889 



•907 



•654 



•840 



[ -897] 



•891 



27 



•881 



-826 



-875 



-753 



•872 



•785 



-756 



[ ^834] 



•757 



•845 



•864 



■921 



28 



•687 



■867 



■757 



•877 



[ -891] 



•715 



-875 



•910 



•764 



-923 



•831 



•909 



29 



[ -798] 





•822 



-864 



•834 



•729 



'-838 



•763 



•856 



[ -904] 



•769 



-845 



30 



•687 





■875 



[ -824] 



-822 



•732 



[ •83,3] 



•806 



•880 



-930 



-973 



-832 



31 



•885 





•854 





-972 





•782 



•812 





-938 





[ -886] 



Mean 



0-852 



0-873 



0-855 



0-800 



0-845 



0^803 



0^820 



0-850 



0-837 



0-860 



0-904 



0-878 



MAG. AND MET. OBS. 1843. 



3 Z 



