131 
Dividing the 24 hours into day and night periods of 12 
hours each, we have — 
Inches. Frequency, 
Total rainfall from 6h. a.m. to 6h. p.m. = 10-925 ... 337 
„ „ 6h. p.m. to 6h. a.m. = 10-929 ... 417 
It appears, therefore, that the average fall of rain during 
the night was sensibly the same as that during the day ; but 
the frequency of rain was much greater during the night than 
the day. 
Dividing the day into four periods of 6 hours each, we 
have — 
Inches. Frequency. 
Noon to 6h. p.m 4*930 155 
6h. p.m. to midnight 5*536 205 
Midnight to 6h. a.m. 5 -39 3 212 
6h. a.m. to noon 5*995 182 
# 
These results show that the greatest amount of rain fell in 
the fourth quarter of the day, reckoning from noon ; and the 
least in the first quarter ; and that the amount which fell in 
the second quarter was slightly in excess of that which fell in 
the third. The frequency of rain was least in the first quarter 
and greatest in the third. 
The six consecutive hours in which the largest quantity of 
rain fell were from 4h. a.m. to lOh. a.m., the amount being 
6*461 inches, and the amounts in the three following six- 
hourly periods were 
lOh. a.m. to 4h. p.m 4-250 inches. 
4h. p.m. to 10b. p.m 5*939 „ 
lOh. p.m. to 4h. a.m 5*204 „ 
If now, the numbers in the last column of the above table 
are arranged in eight groups, and the sums of the numbers in 
each group taken, we have the following remarkable results 
