CONTENTS 



Introduction page 207 



Sounding machines 208 



Wire soundings 208 



Echo soundings 208 



Comparison of wire and echo soundings 212 



Tiie Scotia Arc 214 



Detailed analysis of the various sectors of the Scotia Arc 219 



Tierra del Fuego to the Shag Rocks 219 



South Georgia and the Shag Rocks 221 



South Georgia to the South Sandwich Islands 224 



South Sandwich Islands to the South Orkney Islands 225 



South Orkney Islands to Clarence Island 227 



Soundings in other localities 229 



South Shetland Islands and adjacent waters 229 



Bellingshausen Sea 232 



Other sounding work 233 



Echo-sounding table compiled from observations made in the South Sand- 

 wich Deep 236 



Plates XLV-XLVII following page 236 



Charts 1-7 ill separate chart-case 



