206 Transactions of the Royal Society of South Africa. 
Table 1. The azimuths are counted plus when the deviation is counter- 
clockwise up to 180°, and minus when it is clockwise up to the same 
angular distance. Thus the mean azimuth in January, 1897, was 122°, and 
because the normal mean azimuth for January is 85° the deviation appears 
as +37°. The individual monthly azimuths vary much more widely from 
the normal means than the annual ones do, the range of deviation being 
the best part of two right angles on one side or the other of the normal. 
So also the monthly deviations of the magnitude of the resultants given in 
Table 4 are considerable. 
Kenihvorth. 
Kimberley. 
Difference. 
Inches. 
Inches. 
Inch. 
Jan 
26-047 
25-970 
•077 
Feb 
•080 
26013 
•067 
Mar 
•063 
25-993 
•070 
April 
•202 
26-131 
•071 
May 
•190 
•117 
•073 
Jun 
•319 
•242 
•077 
July 
•214 
•140 
•074 
Aug 
•234 
•161 
•073 
Sept 
•165 
•096 
-069 
Oct 
•070 
-000 
•070 
Nov. 
•041 
25-967 
•074 
Dec 
•023 
•951 
•072 
Year 
26-137 
26-065 
•072 
Table 5 gives the deviations of each month's mean wind velocity from 
the normal means. The normal means are shown at the foot of the Table. 
If this Table could be entirely trusted, the last column (showing the annual 
deviations) would indicate a more or less gradual falling off in the velocity 
of the wind year by year. It is probable, however, that this result is partly 
real and partly due — 
(1) To some wearing of the bearings of the Eobinson anemometer, and 
(2) to some gradually increasing obstruction to the exposure of the instru- 
ment by growing trees. From a meteorological point of view these trees 
are a great nuisance. They seriously handicap not a few of the observations 
made at Kenilworth, and cannot, besides, by any stretch of the imagination, 
be called beautiful. As to the wearing of the bearings, this, such as it is, 
is caused by the grit which is blown about in every dust-storm, and which 
penetrates everywhere. 
Table 6 gives the jplus and minus values of barometric pressure for 
