Pressure and Temperature Results for the Great Plateau. 259 
The numbers in 33-36 want little explanation. Their salient 
features only require a cursory inspection. We see that the highest 
mean maxima occur towards the end of December on the table-land ; 
from a fortnight to three weeks later on the lower land; not appear- 
ing on the coast until the end of January. Again, on the table-land 
June is a little colder in the daytime than July; on the lower land 
July is a little colder than June; while on the coast July and August | 
are both a good deal colder than June. Im all the three sets of 
stations the difference of time between the highest and lowest 
maximum is just about six months. The average ranges of mean 
monthly maximum are— 
(Mal oleslbewadl SueMMOIOS | hsbcrcoou\oenocdaonoasoucen ASS 
Middle OEM g eg Te Ree cei geen Os 18°°4 
Coast eT eR RR Nair ante ae Ne A No he 10°-9 
In each set the highest and lowest monthly minima are reached 
a little later than the corresponding maxima, and are sufficiently 
pronounced to place the general highest mean temperature (z.e., 
4{M + m]) of the whole country between the middle and end of 
January, and the lowest averages in July. But on the table-land 
July is very little colder at night than June, though much colder 
than August; in the middle stations August is somewhat warmer 
than June ; while on the coast June is warmer than August. The 
average ranges of mean monthly minimum are— 
Hable= amd soraulOmMse eens eeeke te eee eee 26°°4 
Middle 2a Ws OU See oid er eNO 5 eg 20°:6 
Coast MPO h EO PE ay SURE err ae HERD a 114k) 
The average annual ranges of monthly mean temperatures are— 
Rable-Band) Statlonise ses nle ss ee nee 25°°0 
Middle is hor Peete crs rN Teh as, Mal ie 19°:4 
Coast OP DDG a eV BRR ERE Noah nd es TPIS) 3 
The unlike influence of ocean and land upon the insolation and 
radiation to which the air is at.any time subjected, is strikingly 
illustrated by the mean monthly range of temperature. Upon the 
table-land the curve is a simple one, having only a single maximum 
and minimum. The former comes in September, the latter in March. 
Bloemfontein and Aliwal North are almost identical, but Kimberley 
and Philippolis differ somewhat from them and from each other. 
* The average temperature ranges of the middle stations are almost the same as 
the means of the averages of the coast and table-land. 
