Pressure and Temperature Results for the Great Plateaw. 277 
graphically in Fig. 4 in which the thin black line represents the 
temperature, and the thicker red line the pressure, at each place. 
All three places begin the month with a rising temperature which 
in each case comes to its highest value about the 4th. From the Ist 
to the 13th the temperatures of Adelaide and Kimberley are much 
alike in their changes, and not greatly different in quantity. But 
between the 13th and 22nd there is a great dip at Kimberley, 
defining, in fact, the coldest period of the year, and apparently 
delaying the rise of temperature to such an extent as to materially 
alter the coefficients in the cosine formula; whereas the Adelaide 
temperatures show on the whole a gradual increase. The Cordoba 
temperatures fall uniformly from the 3rd to the 11th, the cold period 
lying between the 3rd and 20th. During their cold periods the 
temperature gradients at both Kimberley and Cordoba are nearly 
identical, and both by a coincidence have a “step” half-way down, 
although that at Cordoba is very small, the much larger one at 
Kimberley thrusting the actual minimum a full five days later than 
the date of its appearance at Cordoba. It is curious, however, that 
a much bigger step down is shown by the curve of mean daily 
temperatures of Cordoba for the period 1878-92, although the total 
fall occupies the same days of the year. A somewhat colder period 
visits Cordoba earlier and reaches its lowest mean temperature about 
June 21st. But it depends altogether on the lowness of the maxima, 
the July cold period, on the other hand, depending upon the lowness 
of the minima. 
The Cordoba temperatures and pressures agree most consistently 
to differ, pulsating in opposite phases throughout the month. The 
Kimberley phases, on the contrary, have little in common or in 
contrast, such correspondence as there is suggesting that the. 
temperature changes follow the pressure changes after a con- 
siderable interval of time. The same, though in a less degree, may 
be said of Adelaide. 
It is, to say the least, surprising to find the relationship between 
the July pressure and temperature conditions so completely diverse 
as it is at Cordoba and Kimberley. For both stations are continental, 
both are at a considerable elevation, and both are near the central 
meridian of their respective continents. It goes to confirm the 
conclusion suggested by a comparison of the Durban and the 
Kimberley daily numbers, that the pressure wave and the tempera- 
ture wave of the middle of July at Kimberley are maintained 
somehow in a different way even though they be started by the 
same agency. Perhaps the simplest view is that the depression 
comes in from the Indian Ocean attracted by the suitable tempera- 
