List of Illustrations. 



F;g. 2 



f:?- 3 



Fig- 4 



F:g^ 5 



Fis 6 



Fis. 12 



Sketch-map of the environs of the Ross Barrier showing the position of Mt. Betty 

 and Scott's Nunataks. 



Two rock-specimens from Mt. Betty. Showing intrusions of the light granite in 

 the dark, fine-grained gneiss. «Photo. ' ii. 

 Micro-Photo. Granite-apüte. Mt. Betty. lAnalysedi. 



Rock-specimen from Scott's Nunataks. showing border between medium-grained 

 light granite and fine-grained gray granite. 

 Micro-Photo. Granite. Scott's Nunataks. lAnalystdi. 



Rock-specimen from Scon's Nunataks, showing a band of black biotite along the 

 border between coarse pegmatite and dark fine-grained ampbibolite. 

 Micro-Photo. Labradorite from the "sahlband" of pegmatite. Scott's Nunataks. 

 Micro-Photo. Labradorite (rom the "sahlband" surrounded by biotite-scales. Peg- 

 matite. Scott's Nunataks. 



Segregation of magnetite in pegmatite. Scott's Nunataks. 

 Micro-Photo. Ampbibolite. Scott's Nunataks. «Analysed). 



Micro-Photo. Ampbibolite. Scott's Nunataks, showing intet^rowth of bytownite 

 and quartz. 

 Sketch-map of the Antarctica. According to O. Nordenskiöld. 



