XXV111. ABSTRACT OF PROCEEDINGS. 



were described : — (1) Hypersthene Gabbro ; (2) Augite 

 Peridotite ; (3) Bnstatite Peridotite, containing Picotite ; 

 (4) Pyroxenite. The dyke rock was shown to be a mon- 

 chiquite. The occurrence of these inclusions (xenoliths) 

 taken in conjunction with those occurring at Bulli, Dundas 

 and various localities in the Sydney District, points to the 

 occurence of large areas of basic and ultrabasic plutonic 

 rocks at some distance below the surface in this part of 

 New South Wales. 



EXHIBITS. 



Professor Warren read some notes on hardness of 

 different metals, and exhibited a Sclerometer for testing 

 same. 



Mr. Lenehan exhibited and explained a chart showing 

 drift of the s.s. " Pilbarra," after losing her propeller 

 blades. 



ABSTRACT OF PROCEEDINGS, OCTOBER 4, 1905. 



The General Monthly Meeting of the Society was held 

 at the Society's House, No. 5 Elizabeth-street North, on 

 Wednesday evening, October 4th, 1905. 



H. A. Lenehan, f.r.a.s., President, in the Chair. 



Thirty-six members and three visitors were present. 



The minutes of the preceding meeting were read and 

 confirmed. 



Messrs. F. B. Guthrie and R. T. Baker were appointed 

 Scrutineers, and Prof. Liversidge deputed to preside at 

 the Ballot Box. 



