CONTENTS. 



IV.— CLOUD AND PRECIPITATION 



Kind of Cloud .... 

 Cloud Amount .... 



Mean Cloud Amount 



Cloud and A¥ind at Cape Evans 



Annual Variation of Cloud 



Daily Variation of Cloud 

 Precipitation .... 



v.— PPvESSURE 



Instrmuents and Methods 



Mean Pressure and Annual Variation 



McMurdo Sound 



Framheim .... 



Cape Adarc .... 

 Geographical Distribution of Pressure 

 Daily Variation of Pressure 



Fourier Coefficients 



Tvventyfour-hourly Period 



Twelve-hourly Period 

 Non-periodic Pressure Changes 



Pressure Waves 



Pressure Surges 

 Pressure Correlation 



Correlation of Mean Monthly Pressure within the Antarctic 



Pressure Correlation between the Antarctic and Surrounding Places 



VI. -PRESSURE, WINDS AND WEATHER .... 

 Pressure Waves and Pressure Distribution 



Pressure Waves and Winds ..... 



Theoretical Discussion of the Effects of Pressure Waves 



Comparison of Theory with Observations . 

 Pressure, Winds and Weather at Cape Adare . 

 Pressure, Winds and AVcather at the Gauss Station 

 Conclusions ......... 



VII.— THE GENERAL AIR CIRCULATION OVER THE ANTARCTIC 



VIII.— UPPER AIR OBSERVATIONS MADE BY MEANS OF BALLOONS 

 Winter Ascents ......... 



Summer Ascents ......... 



IX.— THE HEIGHT OF THE BARRIER AND THE SOUTH POLAR PLATEAU 



The Height of the Barrier 

 Heights on the Beardmore Glacier 

 Heights on the South Polar Plateau 

 The Height of the Antarctic Continent 



X.— ATMOSPHERIC ELECTRICITY 



Potential Gradient 



Annual Variation 



Daily Variation 

 Atmospheric Radio-activity 



Index 



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