RELATIVE Humipiry. 273 
The periods of maxima for the four meteorological seasons are as follow :— 
Spring, 12 10™ p.m. Makerstoun mean time. 
Summer, 12 0™ pm. See ae bah 
Autumn, (0! 45M pir: .csccceneavciees oes cencae 
Winter, PNG ata NR Rcccsccicce seuateecseniee 
The Year, PaO Pasar ad coe letectedvidc meth amreaeinas 
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°10™ 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 periods of maxima and minima for the four astronomical seasons are— 
Spring, principal max., 1" 40™ p.m. 
Summer, vsecreee 12 20™ p.m. Secondary min., 4" 10™ p.m. Secondary max., 54 O™ p.m. 
Autumn, agnidesacarseees QE ODN OOns «ee «© 40m pw, Seecsdseccsnces, 5H J Qm P.M. 
Winter, decrenk anesavious Wil WII()PL pan’ 
The mean pressure of aqueous vapour for the year occurs at 8" 10™ a.m. 
Schad ba C pao Set cRbeCnceH ook: Pen EE Ee ae REee pavslsn se aeeuhdguecste) POn OM care 
The interval between the periods is, . : ; 2) Ze Om; 
Range of the Diurnal Variation of the Pressure of Aqueous Vapour.—tThe 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. 
Oct. 
[0-825] 
-763 
842 
848 
821 
876 
831 
899] 
911 
975 
978 
774 
+784 
-807 
-828] 
819 
912 
874 
COAnNauPwnw= 
0-852 | 0-873 
MAG. AND MET. obs. 1843. 
