132 Transactions of the Boyal Society of South Africa, 
anticyclone over Natal. Cold southerly winds replaced the warm northerly 
ones. The conditions were for thunder, rain, and snow. 
On the 10th the "high" spurred along the south coast, and the 
eastern " lows " had yielded. The narrow " col " over the Transkei indi- 
cated thunder and rain. The cold southerly winds over the east kept up 
the snow conditions. The Natal secondary now rested over the eastern 
ocean. Everything pointed to a general clear up, but with a continuance 
of cold winds. On the 11th the general winds were south-east along the 
advance northern edge of the moving anticyclone, which was travelling 
from WNW. to ESE. ; the col " was widening, but the equatorial tongue 
had intensified, and there was no indication of a rise in temperature. On 
the 12th a cyclone was over the Indian Ocean to the east of Natal ; this 
surged back the isobars and caused the Transvaal anticyclone to retreat to 
the WNW. The equatorial tongue had been almost obliterated ; mean- 
while the moving anticyclone was well to the south of the land, and the 
Namaqualand one was re-forming and pressing over the Interior, helping 
to diminish the width of the low-pressure tongue. The effect of encroaching 
high pressure from the west and the surge back of the " low " from the east 
increased the gradients and brought very strong southerly winds and low 
temperature. 
On the 13th all the "lows" had gone, and the Transvaal anticyclone 
and the Namaqualand one were connected by a high " col," while the 
moving " high " had left the land and was evidently over the south-eastern 
ocean. Conditions were for fine, clear, cool weather, and, for a short 
time at any rate, cold winds. 
There is no doubt that the cyclone of the 12th came from the Indian 
Ocean. It must have been just recurving, and the fact that the moving 
anticyclone passed to the south of the Cape in an ESE. direction (most 
unusual for June) allowed the cyclone to touch Natal. Had this not 
happened there would have been a clear up on the 12th. 
Without doubt moisture was carried from the east coast, round the 
Transvaal anticyclone, and brought by northerly winds over the Transvaal 
as far as the east of the Cape. The advent of the cold southerly wind on 
the 9th brought rain, and the temperature at various places falling below 
freezing-point snow was a natural consequence. 
To further illustrate this. On the morning of the 8th temperature was 
60° at Queenstown, 61° at Stutterheim, 60° at Graaff Eeinet, 69° at Somer- 
set East, and 68° at King William's Town. On the morning of the 10th 
these were 38°, 40°, 41°, 40°, and 45°, and, with slight fluctuations, this 
low temperature was maintained until the 13th. 
It is very strange that the more elevated stations did not feel the effect 
of the warm wave so much, nor did the full effect of the cold wave appear 
until the 10th. Thus, on the morning of the 8th temperature was 49° at 
