lxx. ABSTRACT OF PROCEEDINGS. 



The Hon. Secretary read a contribution to the discussion by 

 Mr. Griffith, and the following members took part, Messrs. J. 

 Bruce, J. H. Cardew, J. Davis, H. Deane, F. B. Guthrie, W. M. 

 Hamlet, J. M. Smai], and Dr. Quaife. 



The Chairman announced that an excursion to the Ultimo 

 Power House would be held, at the invitation of Mr. H. Deane, 

 on Friday July 21st, at 4 p.m. 



Monthly meeting held August 16. 

 This meeting was held in the Lecture Room of the University 

 Chemical Laboratory. All formal business was postponed. 



Prof. A. Liversidge delivered a lecture, illustrated by many 

 experiments, on " Liquid Air." 



A very cordial vote of thanks to the lecturer was moved by 

 Mr. C. O. Burge, seconded by Prof. A. Stuart, and carried by 

 acclamation. 



The meeting then adjourned to the P. N. Russell School of 

 Engineering, where refreshments had been provided. 



Monthly meeting held September 20. 



There were present Mr. Norman Selfe (in the Chair) and 

 eighteen members and visitors. 



Mr. J. I. Haycroft read a paper on " Le Pont Vierendeel. r ' , 



Mr. G. H. Knibbs made some remarks on "Ruled Surfaces," 

 and on the applications of the Prismoidal Formula. 



The discussion on Mr. Knibbs' paper entitled " Some applica- 

 tions and developments of the Prismoidal Formula," read at the 

 previous meeting of the Royal Society was opened by Mr. J. I. 

 Haycroft, and continued by Mr. C. Merfield and Mr. H. Deane. 



Exhibits were supplied by Mr. H. Deane and the Chairman. 



The Hon. Secretary reported that at the invitation of Mr. J. 

 Davis a most successful excursion to the Sewerage works at North 

 Sydney and Double Bay had been held. 



