222 Transactions of the South African Philosophical Society. 



hot winds on two consecutive days, and now and then two in a 

 week. For example : — 



m. 8 a.m. M. 



1889, April 11 65° 90° 106° 



12 67 68 90 



13 64 64 80 



14 62 71 90 



15 68 90 98 



16 65 66 80 



Here we see that although there were hot winds on the 11th, 

 12th, 14th, 15th, the mornings (as shown by the minimum tempera- 

 tures) always opened cool. To the unobservant this would appear 

 to have been a hot wind lasting a week. It should be mentioned 

 that the high temperatures of the 11th and 12th are due to 

 one barometric depression, those of the 14th and 15th to 

 another. 



At East London the seasonal distribution of hot winds is very 

 pronounced, there being two maxima of frequency, one in the late 

 spring and the other in the early autumn.* During the whole of 

 summer and the middle of winter they are rare,t as will be seen from 

 the Table below, giving the frequency expressed in the number of 

 times observed in 21 years : — 





Above 90°. 



20° above 

 the Mean. 





Above 90°. 



20° above 

 the Mean. 



Jan 



No. 

 1 

 1 

 2 

 6 

 9 

 1 



No. 

 1 



1 



5 



7 



Aug 



Sept. , ... 



Oct 



Nov 



Dec 



Total 



No. 



1 



13 



8 

 3 



"i 



No. 

 1 



Feb 



Mar 



April 



May 



18 

 10 



4 





47 



47 



In this matter of seasonal distribution they differ in a marked 

 manner from the less frequent though fiercer hot winds of Durban, 

 for at the latter place they are confined almost entirely to the spring 

 and early summer. On the other hand, judging from the Eeports 



* Over the coast districts further west there is a similar semi-annual rainfall 

 period. 



f There are, however, frequently, in the winter, warm winds, say 15° above the 

 mean of the month. 



