294 
Tratisactious of the Royal Society of South Africa. 
Table II. — Mean Daily Fressure and Air Movement during the Tropical 
Day. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
S 
15 
16 
17 
18 
19 
20 
21 
24 
25 
26 
27 
Month 
Month. 
Pressure 
(inches). 
26125 
26126 
26128 
26130 
26133 
26-136 
26-135 
26-134 
26-132 
26-131 
26131 
26-132 
26-132 
26135 
26-138 
26-139 
26-135 
26-132 
26130 
26-133 
26-136 
26137 
26-135 
26-134 
26-134 
26131 
26125 
26-132 
Velocity 
(miles a day). 
125 
125 
124 
126 
128 
128 
126 
125 
125 
125 
125 
126 
127 
126 
123 
123 
124 
124 
124 
122 
121 
121 
121 
121 
121 
122 
123 
124 
Tlie barometric curve has three crests, the principal one falling about 
two days later than the day of the moon's greatest south declination, the 
two others (which are almost as great) coinciding with the moon's passage 
north or south of a parallel lying a little north of the equator. The total 
range of pressure in the month is -014 inch in smoothed values and '019 in 
unsmoothed. The equatorial crests rise -004 inch above the mean line. 
Pressure when the moon is going north exceeds that when it is going south 
by about '003 inch. 
Quite a hundred years of observation would be necessary to give equally 
trustworthy wind values, but three crests seem also to be indicated. 
