Trans. Roy. Soc. Eclin. y 0L l 



Mr G. W. Tyrrell on « The Petrology of South Georgia."— Plate XCIV. 



Fig. 3. x 24. 



Fie;. 2. x 44. 



Fig. 4. x 8. 



Fig. 5. x 12. 



Fig. 6. xl2. 



Rocks of South Geokgia. 



