XXVlll. ABSTRACT OF PROCEEDINGS. 



Dr. Cotton pointed out that a study of the time and 

 direction of the New Britain earthquake lends support 

 to the view that earthquakes are precipitated by tidal 



stresses. 



Monthly Meeting, 9th June, 1920. 

 Professor David in the Chair. 



Sixteen members and seven visitors were present. 



exhibits: 



1. From the Mining Museum : — (a) a curiously-carved 

 tuffaceous stone from New Guinea (collected by Mr. Mac- 

 Donnell); (b) model of a gold nugget recently found at 

 Mudgee ; (c) travertine from Belubula Caves ; (d) copper 

 sulphate from Mount Hope Mine, formed by the decompo- 

 sition of copper pyrites; (e) auriferous mispickel from Hill 

 End ; (f) a polished section of the Yenberrie meteorite 

 exhibiting octahedrite markings. 



2. From the Australian Museum: — (a) crystal of beryl 

 embedded in native bismuth from Torrington ; (b) quartz 

 crystals fractured and re-cemented by secondary silica, 

 from Goodwin's Cut, Kingsgate. 



3. By Dr. Walkom : — A fossil from the Newcastle Coal- 

 measures, possibly an equisitaceous stem. 



4. By Messrs. Andrews and L. J. Jones: — Ice-scratched 

 quartzite boulder from three chains above Beryl Bridge, 

 Reedy Creek, Gulgong district. This was found in steeply 

 dipping Permo-Carboniferous strata, and indicates a new 

 area for Permo-Carboniferous glacial beds. 



5. By Judge Docker : — an enlarged photograph of a 

 mass of ironstone having the appearance of a petrified log, 

 from Wentworth Falls. 



