The Winds of Kinberley. 7 87 
These numbers show, even more convincingly than Table 14, how 
small is the total unbalanced excess of air passing over Kimberley. 
Small even as it is, only amounting to about five miles per day on an 
average throughout the two years, it would no doubt have been very 
much less in the three years comprised in the investigation of - 
directions. 
At this stage we may look at Figs. 3 and 6 in a different light : 
we may assume the former to represent a system in which the air is 
moving with any constant velocity ; the latter as a system formed 
from the second by the intrusion of air-currents of variable strength 
from whatever cause arising. Table 15 is constructed from Tables 
9 and 14 for the purpose of comparing the effects. Here column 1 
contains the hours, columns 2 and 5 the mean hourly component 
movements for a year, columns 3 and 6 the mean relative component 
frequencies—or, which comes to the same thing, the mean movement 
at a constant velocity of 6°6 miles per hour,—columns 4 and 7 are 
the departures of the variable velocities observed from the constant 
velocities assumed, column 8 is the resultant departure, being equal 
to the square root of the sum of the squares of corresponding 
numbers in columns 4 and 7 (decimal places being omitted through- 
out). The actual magnitudes of the numbers, regardless of sign, 
in columns 2 and 5, are in almost all cases greater than those of 
columns 3 and 6, as might be expected from the fact mentioned in 
reference to the values of columns 7-10 of Table 12.* 
Fig. 7 gives a graphical representation of the values V— OC, v-c, 
found in Table 15, the curve of barometric variation being also 
inserted. Some of the minor irregularities might possibly disappear 
in a greater number of years of observation. But as it stands 16 
places the north component variation in as uninfluential a position 
as the north components of frequency and movement. The east 
component curve, on the contrary, is of remarkable interest. If its 
asperities be not smoothed by future research, then it undoubtedly 
contains three pairs of maxima and minima. The three maxima 
precede by respectively lengthening intervals, the first (lesser) baro- 
metric minimum, and the two barometric maxima, the most pro- 
nounced minimum of the east component variation being also in 
advance of the most pronounced barometric minimum; whereas the 
north component variation seems to follow, with a curious exception 
at 8 p.m., the diurnal pressure tides. Now we have seen that the 
east and west swing of the vane coincides with the variations of tem- 
* Recollect that the component frequencies are derived from the registers of 
three years, the component movements from only two. For the purposes of this 
comparison the former are accounted standard forms for any year, 
