168 Transactions of the Royal Society of South Africa. 
In the following tables for preceding winds it will be seen that the 
so-called normal east and west winds can be considerably reduced : — 
West, A.M. 
Following. N. NW. W. SW. S. SE. E. NE. C. Total. 
Times 13 6 237 46 11 24 55 15 8 415 
East, P.M. 
Times 27 1 14 5 8 6 96 55 17 229 
Taking the west winds first, it will be seen that they were normal 
upon 178 occasions, leaving a balance of 237 as shifting winds. 
So with the east winds, these were normal upon 96 occasions, leaving 
a balance of 133 as shifting winds. 
With reference to the east winds, it will be noticed that a large per- 
centage of the previous winds were from the NE. ; this is the true backing 
for a sea breeze displacing a land one, i.e., NE. to E. 
Now, do the west and east winds, analysed as entities apart from 
other winds, show signs of following land and sea breeze influences ? In 
the foregoing arguments ESE., E., and ENE. have been taken as 
equivalent to an east wind, and WNW., W., and WSW. as equivalent 
to a west one. 
If these be separated the foregoing contention can either be proved or 
disproved. 
The following gives the days when WNW. winds prevailed : — 
Jan. Feb. Mar. April. May. June. Julj^ Aug. Sept. Oct. Nov. Dec. Total. 
AM. 14 8 9 8 10 7 7 7 8 9 10 19 116 
P.M. 2349 750453 25 49 
The following are for the WSW. direction :— 
Jan. Feb. Mar. April. May. June. July. Aug. Sept. Oct. Nov. Dec. Total. 
A.M. 4541 022644 9 13 54 
P.M. 19 15 15 12 9 10 18 17 18 17 14 24 188 
Total, both winds 407 
It will be borne in mind that 1,058 observations were made of west 
winds ; by deducting the WSW. and WNW. ones, totalling 407, we get 
651 as the actual number of true west winds. By comparing the two 
tables it is patent that the WNW. is more of a morning wind and the 
WSW. more of an evening one, the correct swing of land and sea breezes. 
There is another point to consider in connection with west winds. If 
land and sea breeze conditions affect the three components, we should 
expect that towards the evening a veering would take place from WNW. 
