The Uainfall of South Africa. 
367 
Wind easterly ; doubtful if rain will follow, unless it is seen that 
there is every probability of a change to the west. 
Wind north or south ; very uncertain if rain will follow or not. 
Section (b). — Out of 36 cases, 21 were followed by rain at the Royal 
Observatory within 24 hours, and 15 not. It was blowing westerly on 
15 days out of the 21, and on 9 out of the 15 ; the easterly element being 
unimportant. Out of the 15 days rain fell either at L'Agulhas on that or 
the next day, or else there was rainfall at the Royal Observatory within 
48 hours upon 6 occasions, leaving only 9 days when no rain at all 
followed. We thus get — 36 days, total number. 
27 days, rain followed ; being 75 per cent. 
9 days, no rain followed ; being 25 per cent. 
Prediction. — Great probability of rain. 
Section (c). — This condition existed on 23 occasions, and only on 5 of 
these did rain follow at the Royal Observatory within 24 hours. The 
wind was north-west and west on all the 5 wet days, the balance being 
17 days north to east and 1 day calm. 
Prediction. — Dry weather. 
DIVISION (2). 
Section (a). — Wind was easterly on all but one occasion. In 6 cases 
rain followed and in 6 dry weather ; only on 4 days did rain in excess of 
0-05 in. fall. 
Prediction. — Dry weather, unless rain has already fallen, when, 
no doubt, it will continue. 
Section (b). — This only happened on 5 occasions during the 5 years, 
so it is not an important condition ; on 2 occasions rain followed and on 
3 it did not ; the wind was easterly each time : only upon 1 day did 
rain bevond 0*05 in. fall. 
Prediction. — Dry weather. 
Section (c). — During the 5 years this occurred upon 9 occasions, and 
in no instance did rain follow. 
Prediction. — Dry weather. 
DIVISION (3). 
Section (a). — There was a total of 28 cases, of which 7 were followed 
by rain and 21 by dry weather ; on 20 days the wind was easterly ; on 
4 days less than 0-05 in. of rain fell, and only on 3 days was the prediction 
for wet weather fulfilled by more than this amount falling. 
Prediction. — Dry weather, or less than 0*05 in. of rainfall. 
