liv. ABSTRACT OF PROCEEDINGS. 



in South Australia. The mound-springs, a characteristic 

 feature of the edge of the Artesian Basin, indicate at least 

 three periods of variation in the amount of " head " 

 developed, possibly as a result of varying rainfall, in the 

 past. 



Prof. David supplemented Mr. Andrews' address with 

 remarks on the possible causes of the convergence of the 

 hydraulic grades on Lake Eyre, 



Mr. Poole also spoke briefly on the same subject. 



Special Meeting, 27 th October, 1921. 



Mr. Andrews in the Chair. 



About thirty-six members and visitors were present. 



This meeting was convened to enable the section to hear 

 and see something of the results of Prof. David's recent 

 journey to South Australia and West Australia. 



The lecture, which was illustrated by lantern views and 

 by a large collection of specimens, dealt principally with 

 features of geological interest in the Nullarbor Plains, the 

 Irwin River Coal-field of West Australia, the Proterozoic 

 rocks of the Pilbara region, and the salt-lake region of the 

 south-west of South Australia. 



Monthly Meeting, 21st November, 1921. 

 Mr. E. O. Andrews in the Chair. 

 Seventeen members and seven visitors were present. 



exhibits : 



1. By Mr. Dun : Teeth of a Ceratodus from late Tertiary 

 deposits at Wentworth. 



2. From the Australian Museum : A specimen of native 

 tin, a very rare mineral, from Nigeria. 



3. By Mr. Milson (a visitor, of the U.S.A. Geological 

 Survey): Photographs of oil-wells in America. 



