382 Transactions of the Boyal Society of South Africa. 
DIVISION (2). 
Sectio7i (a). — No cases. 
Section (b). — There are only 2 cases, each followed by dry weather. 
Section (c). — Here w^e have 12 cases, 10 of which were followed by dry 
weather ; on the remaining days only 0'02 in. fell on each day. 
Prediction for Division. — Dry weather. 
DIVISION (3). 
Section (a). — No cases. 
Sectio7i (b). — We have but 3 cases, 2 followed by rain. 
Section (c). — This condition prevailed upon 13 occasions ; after 7 of 
them rain fell, and after 6 dry weather followed. From a consideration of 
all the cases, I have come to the conclusion as follows : — 
Prediction for Division. — 
Pressure at Clanwilliam below 30'10 in., wet. 
30-10 in. to 30-20 in., doubtful. 
,, ,, ,, above 30*20 in., dry. 
SUB-GEOUP (D). 
This would be brought about by an advancing high-pressure area 
moving from the west and just skirting Clanwilliam. Of course the 
actual increase in pressure at the Eoyal Observatory may only be apparent, 
and other conditions may be at work causing rain ; these will be con- 
sidered in their places, but the main influence of the group leads to fine, 
dry weather. 
DIVISION (1). 
Sections (a), (b). — No cases. 
Section (c). — Here we have 5 cases, and dry weather followed each. 
Prediction for Division. — Dry weather. 
DIVISION (2). 
Section (a). — There are 3 cases, each followed by dry weather. 
Section (b). — There are 9 cases, each followed by dry weather. 
Section (c). — This happened upon 35 occasions, and upon 27 of them 
dry weather followed. Of the 8 remaining, less than 0-05 in. fell upon 
6 days, and on the remaining 2 days rain would not have been expected. 
Prediction for Division. — Dry weather. 
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