62 
the period ending October 27 and that ending November 6, the differ¬ 
ence on this occasion being 10'9 in., this also being the largest difference 
in the year. 
The period of least changes, generally, between consecutive ten-day 
periods, extends from July 19 to October 7; but the driest ten-day 
period, however, does not occur in this interval, it being from March 22 
to 31 ; the next in order is March 2 to 11, and then February 10 to 19. 
The wettest period of ten consecutive days in the year is from Octo¬ 
ber 18 to 27. The other periods of large falls are August 9 to 18, 
August 19 to 28, and September 18 to 27. 
It is worthy of notice that both the driest and wettest decades are 
coincident in date with those as found in the reduction of the Green¬ 
wich observations. 
By taking the sums in fifteen-day periods the next Table was 
formed. 
TABLE XVII. 
Showing the Sum of Rainfall in Fifteen-day Periods. 
1 
January 1-15 . 
36-29 
June 30 to July 14 . 
41-62 
„ 16-30 . 
36-68 
July 15-29 
56-25 
January 31 to February 14 
34-30 
July 30 to August 13 
55*02 
February lo to March 1 . 
33-66 
August 14-28 . 
48-64 
March 2-16 . 
31-08 
August 29 to September 12 
o2"84 
„ 17-31 . 
26-84 
September 13-27 
53-64 
April 1-15 
33-26 
September28 to October 12 
56-21 
„ 16-30 
33-35 
October 13-27 . 
57'31 
May 1—15 
43-82 
October 28 to November 11 
46-59 
„ 16-30 
39-38 
November 12-26 
44-72 
May 31 to June 14 . 
45-04 
November 27 to December 11 
41-50 
j June 15-29 
42-21 
December 12-26 
32-99 
The differences between these numbers are occasionally large. Be¬ 
tween the periods ending April 30 and May 15 the difference is 105 in.; 
between those ending July 14 and July 29, 14’6 in.; and between those 
ending October 27 and November 11, 10'7 in. 
The fifteen-day period of least rain is from March 17 to 31, and the 
next in order is from March 2 to 16. 
The period of most rain is October 13 to 27, and the next in order is 
July 15 to 29, and September 28 to October 12. 
