52 . 
Proceedings of the Royal Soeiety 
the rainband attained each intensity in each of the seven months, 
and how often it was followed (within twelve hours) by rain in 
each case : — 
Table I. 
• 1882. 
Month. 
D-t-7T>F. 
Rain 
fol- 
lowed. 
D-t-7T = F. 
Rain 
fol- 
lowed. 
D-f 7 t> 6<F. 
Thin Lines. 
D-f 7T=or 
<6. 
Rain 
fol- 
lowed. 
Indis- 
tinct. 
Rain 
fol- 
lowed. 
Dis- 
tinct. 
Rain 
fol- • 
lowed. 
June, . . 
8 times 
6tms. 
4 times 
4tms. 
3 tins. 
2tms. 
6tms. 
4 tms. 
9 times 
5 tms. 
July, . . . 
11 » 
11 
3 „ 
2 „ 
8 „ 
7 „ 
6 „ 
3*„ 
1 „ 
l^-„ 
August,! 
4 „ 
4 „ 
10 „ 
6„ 
3 ,, 
10 „ 
1 „ 
0 „ 
0 „ • 
September, . 
3 „ 
3 ,, 
3 ;> 
6 ,, 
9 » 
3 „ 
■5 
1 n 
4 „ 
9 „ 
October, . . 
7 „ 
fi „ 
4 ,, 
4 „ 
9 „ 
6 „ 
2 „ 
0 V 
8 „ 
3 „ 
November, . 
0 „ 
0 n 
3 „ 
3 „ 
1 » 
1 „ 
2 „ 
2 „ 
24 „ 
14 „ 
December, . 
4 „ 
4 „ 
2 „ 
2 „ 
7 „ 
5 „ 
1 „ 
1 n 
12 „ 
5t „ 
Total, . . 
37 „ 
34 ,, 
35 „ 
26 „ 
43 „ 
27 „ 
32 „ 
12 „ 
28 „ 
*Very slight showers. t Observations this month were made at Callander. 
tRain or much snow. 
The following summary (Table II) shows that the probability 
of rain falling increases with the increase of intensity of the rain- 
band in a very regular manner. When D -F tt was = or< 5 rain fol- 
lowed more frequently than might be expected, but fourteen of 
these occasions were in the cold month of November and five in 
December, and on many occasions there were only slight showers. 
Table II. 
D -f 7T 
Number 
Rain followed. 
of times. 
No. of 
times. 
or per 
cent. 
= or< h 
58 
28 
48 
> 5 < F Thin lines distinct 
32 
12 
37 j 
t 
1 
^ 50 
> & < F Thin lines indistinct 
43 
27 
63 ] 
1 
= F 
35 
26 
74 
>F 
37 
34 
.92 
The dependence of the rainband on the probability of rain is 
