THE HEART OP THE ANTARCTIC 



wind for two days more, the blizzard freshened again on 

 March 1, continuing to blow on March 2. The Nimrod 

 experienced these south-easterly winds all the way back, 

 from Cape Royds to Port Lyttelton in New Zealand, 

 arriving at the latter port within twelve and a half days 

 after she left Cape Royds. 



It is, of course, premature as yet to generalise on the 

 result of these observations. It is hoped that when the 

 Meteorological Memoir is completed that the observations, 

 especially on the movements of the higher atmosphere, 

 will contribute to our knowledge of meteorological con- 

 ditions and the laws which control them in the Southern 

 Hemisphere. 



Additional Notes By JAMES MURRAY 



In regard to the relation of barometric pressure and 

 temperature to wind-storms, the accompanying diagram 

 shows the curves traced by the daily means of barometric 

 pressure, wind, and air temperature. The curves are 

 drawn to such scales as will make them readily comparable. 



The uppermost curve is that of the daily means of 

 the barometric readings, the middle curve is the wind, and 

 the lowest one is the temperature. The dates are marked 

 at the top, and each vertical line represents an interval 

 of one day. The period selected includes the whole of 

 May and June 1908. The scales are marked vertically 

 at the left-hand side, the barometer in inches and tenths, 

 the wind in miles per hour (from zero up to 40) , the tem- 

 perature in degrees Fahrenheit (from plus 20° to minus 

 20°). 



The midwinter period is selected because at that time 

 two features characteristic of the Antarctic climate are 

 best developed. The first is the absence of constant and 

 definite correspondence between barometric movement 



412 



