212 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Correlations with M^Murdo Sound. 
Dr Simpson, F.R.S., at the Australian Meeting of the British Association, 
drew attention to the existence of a large negative correlation between the 
barometric pressure at Cape Evans and pressure in Tasmania and Australia.* 
We have extended the inquiry to New Zealand and some other places in the 
South American area, with the object of bringing the M‘Murdo Sound data 
into association with those of other regions which have formed the subject 
of special investigation for the period December 1901 to November 1909. 
In this way some glimpses have been obtained of the relations between 
pressure and temperature in the Ross Sea and other regions. For pressure 
we have taken seasonal values for the four years utilised in connection with 
the South Orkney data, while for temperature we have supplemented 
Captain Scott’s data by a fifth year derived from Shackleton’s 1908-09 
expedition. The following are the more striking seasonal contrasts 
obtained, the values for the respective seasons being referred to a four 
years’ mean for pressure, and a five years’ mean for temperature. In treat- 
ing the data from New Zealand and the Straits of Magellan we have taken 
the means of the departures for several stations, the departures from the 
normal for individual seasons being all of the same sign in both these two 
regional groups. The data are tabulated in Table III. 
Pressure. 
In summer the pressure departures at MAIurdo Sound are of the 
same sign as at Perth (West Australia) and at Point Galera on the Chilian 
coast, and the reverse of those at New Zealand and the Straits of Magellan. 
At the South Orkneys, as already pointed out, the negative correlation 
is weak. 
In autumn the negative correlation with New Zealand and Magellan 
Straits is again strongly marked, and this prevails on the Atlantic coast of 
South America up to the latitude of Monte Video. The correlation with 
the South Orkneys fails in the autumn of 1912. 
In winter the contrast between M‘Murdo Sound and the South Orkneys, 
Magellan Straits, and the Atlantic coast of South America is strongly 
marked, and extends over the South Atlantic as far north as St Helena. 
The correlation with New Zealand is relatively weak. At Suva, Fiji, the 
pressure departures are in harmony ,with those at MAIurdo Sound. 
In spring the negative correlation with New Zealand and the South 
* Discussion on Antarctic Meteorology opened by G. C. SimjDson, D.Sc., Brit. Ass. Rep., 
Australia, 1914, p. 302. 
