252 DUMOULTN ISLANDS. 



Islands proved to be inhabited^ and the natives 

 exhibited no hostile feeling- towards the Bramble's 

 people. A specimen of the rock, taken from the 

 shore and given me by Lieutenant Yule, is a very 

 curious siUceous breccia ; when viewed from the sea 

 I had observed the chffs to exhibit horizontal and 

 vertical fissures — apparently lines of cleavage — as 

 I had seen assumed on various occasions during our 

 last cruize by granite and porphyry. This, at 

 least, indicated a great approaching change in the 

 geological structure of the New Guinea Islands, 

 contrasted with those of the Louisiade Group which 

 had come under our observation. 



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