Abstracts for the Aqueous Vapour. 



163 



TABLE XI. — ^Means of the Pressure of Aqueous Vapour for periods of Three Months, for the Summer and 



Winter Months 1842, and for the Year 1842. 



Period. 



ao"^. 



231'. 



2i. 



5i>. 



Mean of the 

 Four Hours. 



1841. 



in. 



in. 



in. 



in. 



in. 



July, Aug., Sept. 

 Oct., Nov. 



0-355 

 -228 



0-378 

 •237 



0-388 

 -250 



0-389 

 -253 



0-377 

 -242 



1842. 













Jan., Feb., March 



-211 



•217 



•225 



•221 



•218 



April, May, June 

 July, Aug., Sept. 

 Oct., Nov., Dec. 



-297 

 -377 

 -247 



.318 

 -399 

 •254 



•329 

 -407 

 •256 



•327 

 •407 

 •256 



•318 

 •397 

 •253 



Jan., Feb., March, 1 

 Oct., Nov., Dec. J 



•229 



-235 



•241 



•239 



•236 



April, May, June, ) 

 July, Aug., Sept. J 

 The Year 



•337 

 •283 



•358 

 •297 



•368 

 •304 



•367 

 •303 



•357 



•297 



The maximum pressure occurs between 2'^ and 5^, and it is greater in summer than in winter. 



TABLE XII.— Monthly Means of the Relative Humidity, or of the ratio ^'"^s^u^e of Aqueous Vapour ^^^ ^^^ 



rressure at fcsaturation 

 Observation Hours, 20, 23, 2, and 5. 



Month. 



201". 



23''. 



21-. 



5h. 



Mean of the 

 Four Hours. 



1841. 

 July 



0-833 



0-764 



0-718 



0-748 



0-766 



August 



•876 



•793 



-748 



•756 



•793 



September 



•911 



•838 



•812 



•811 



•843 



October 



•884 



•832 



•796 



•852 



•841 



November 



•949 



•891 



•864 



•898 



•900 



1842. 

 January 



•889 



•884 



•839 



•884 



•874 



February 



•895 



•836 



•782 



•803 



•829 



March 



-862 



-799 



•774 



•775 



•802 



April 



•855 



-725 



•638 



•658 



•719 



May 



•854 



-744 



•704 



•710 



•753 



June 



•782 



•687 



•617 



•635 



•680 



July 



-854 



•756 



•706 



•715 



•758 



August 



•877 



-749 



•676 



•685 



•747 



September 



•895 



•802 



•740 



•758 



•799 



October 



•864 



•749 



•666 



•737 



•754 



November 



•897 



•847 



•800 



•863 



•852 



December 



•873 



•880 



•S35 



•863 



•863 



