276 Transactions of the South African Philosophical Society. 
materially change in amount in any given not great interval of time. 
Hence a depression in one spot must be balanced by a crest in 
another.* Where, then, does the July depression come from? and 
what becomes of it? or rather, how does it originate? If it be 
essentially a planetary phenomenon, that is to say set directly in 
motion by outside influences, like the monthly mean temperatures, 
and not by any reflex terrestrial influence, then clearly we must expect 
a collateral process about the same time in other parts of the world, 
its simultaneous aspect varying probably according to the geo- 
graphical conditions of the place. Does this then appear, in any 
manner, elsewhere, on or near the same parallel? The question is 
worth asking, although, unfortunately, only a shadow of a reply is to 
be anticipated for the simple reason that observations have not yet 
been piled upon previous observations industriously enough in the 
southern hemisphere. It has only been possible to attempt it for 
Adelaide and Cordoba besides Durban. The comparison, dealing 
with the whole month, for the two first and Kimberley, will be 
found in Table 43, the temperatures and pressures in the several 
columns having first been ‘“‘ bloxamed’’ in threes. The Kimberley 
numbers refer, as before, to eight years of barometer and ten of ther- 
mometer ; the Adelaide numbers are for the twelve years 1885-96 ; + 
those of Cordoba for the years 1885-92 and 1894-7, the last year 
(1897) having been included to make up the twelve years because 
the results for 1893 were overlooked.| Table 43 is represented 
* This obvious inference has been occasionally denied. Among the various 
explanations of the double diurnal oscillation of the barometer, ranging over the 
whole gamut from the utterly feeble to the egregiously stupid, it has been stated 
that the afternoon minimum is due to the loss of weight by the air due to heating ; 
and that the daily pressure tide does not indicate any inward and outward move- 
ment, but simply an up and down one! Von Siemens languished fondly round a 
twin sister. 
+ From Meteorological Observations made at the Adelaide Observatory, by Sir 
Chas. Todd. The latitude of Adelaide is 34° 57’ S. 
+ And scarcely through any great fault of mine. Tomo ix. of the Anales de la 
Oficina Met. Argentina is published in two parts, both dealing with the meteorology 
of Cordoba, entitled respectively : 
‘¢ Primera parte: Observaciones hechas en la Oficina Central.” 
“‘ Segunda parte: Discusion de las observaciones hechas en la Of. Cent.” 
The first part, published in 18938, contains the complete registers 1872-92. The 
second part, dated 1894, is a full and very excellent discussion of the first, running 
to nearly 500 pages, with 25 plates. After the text above and the corresponding 
tables were complete, it was recollected that the register for 1893 was bound up, in 
the second part, between the discussion and the plates, put there because “ debido 
a la demora en la publicacion de la segunda parte de este tomo, podemos inceluir 
aqui las observaciones al afo pasado [i.e., 1893]. It has not been thought worth 
while to recompute the numbers, or to feel annoyed. 
