RELATIVE HumIpDITy. 275 
Humidity with reference to the Moon’s Age.—The following means of groups indicate a minimum of hu- 
midity about four days before full Moon, and a maximum about four days before new Moon. 
12 days till 18 days, Full Moon, 0:845 27 days till 8 days, New Moon, 0:851 
NOs ha. Di ies «is 0-857 Ores onthed Me waits 0:842 
Oger pr Bes we 0°859 As esac ee 0-851 
PB VME RAE 20) Sew 0-864 Bin iiisah 14... 0°844 
Humidity with reference to the Moon’s Declination—The following means of groups indicate a maximum 
of humidity about four days before the Moon attains its greatest north declination, and a minimum about four 
days before it attains its greatest south declination. 
25 days till 3 days, Moon farthest North, 0-847 11 days till 17 days, Moon farthest South, 0-849 
Oeeecshees 6 0°846 TA eth ches 20) 0°842 
es Bape LO 2 0-838 Se eee 2 0°857 
Cetera Vie 0-844 OO tec csae PM a 0-861 
TABLE XIV.—Hourly Means of the Relative Humidity for each Month and Quarter in 1843, 
Saturation being = 1. 
Period. 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
Spring 
Summer 
Autumn 
Winter 
The Year 
Table XIV. has been formed from Tables III. and VIII. by means of the formula given after Table XII. 
Diurnal Variation of the Relative Humidity—The maximum humidity occurs between 9 p.m. and 5 a.m. 
The minimum occurs as early as 108 30™ a.m. in December, and as late as 2" 30™ in March and September. 
The progression is regular in each month, with the exceptions of June and December; a secondary maximum 
occurs in the former at 1" 10™ p.m., and in the latter at 11" 10™ a.m., the minima occurring two hours before 
and after. The following are the periods of minima for the four meteorological seasons, and also for the four 
astronomical seasons :— 
Meteorological Seasons. Astronomical Seasons. 
Spring, 15 40™ p.m. Spring, 25 O™ p.m. Makerstoun mean time. 
Summer, 25 30™ p.m. Summeryel2) 252 par, (08. eccteecs esse sc0e 
Autumn, 24 10™ p.m. (Aritimn: (2262 0 aMiprar.) ecaen eaeeeereeee cease. 
Winter, 0? 30™ p.m. Winter) 02 "b0™ eM. Sirs occ tesscieaesseevecs 
The year, 1% 50™. 
