XV111. ABSTRACT OF PROCEEDINGS. 



EXHIBITS I 



1. Mr. J. H. Maiden exhibited some acorns of a dwarf 

 oak collected at Gallipoli, by Dr. A. Aspinall, and which 

 appears to be Quercus Libani. Also a photograph of Sir 

 Alfred Roberts, m.r.c.s., e. (1823-1898), who was Hon. 

 Secretary of the Philosophical Society of New South Wales 

 in 1862, and President of the Royal Society of New South 

 Wales in 1888. 



2. Mr. G. H. Halligan exhibited a part of the flange of 

 a 10 inch cast iron pipe eroded by a water jet charged with 

 sand. The pipe was used in connection with the Grafton 

 Water Supply, and was laid on the bed of the Clarence 

 River, where it became embedded in sand. Owing to an 

 imperfect joint, a minute jet of water, under a head of 327 

 feet, emerged from the pipe, and impinging upon the sand, 

 caused the grains to fall within the influence of the jet, 

 and thus provided an efficient scouring agent. The pipe 

 joint finally collapsed twenty-two months after it was laid, 

 about one half of the flange, which was l^inches in diameter, 

 having been more than half eaten away. 



3. Mr. J. Nangle exhibited samples of leather and other 

 work prepared by students of the Sydney Technical College. 



4. Dr. H. G. Chapman exhibited a method for determin- 

 ing the average composition of ten samples of alveolar air 

 by means of one analysis. 



OCTOBER 4th, 1916. 



The three hundred and eighty-fifth General Monthly 

 Meeting of the Royal Society of New South Wales was 

 held at the Society's House, 5 Elizabeth Street, at 8 p.m. 



Mr. T. H. Houghton, President, in the Chair. 



About twenty members were present. 



The minutes of the preceding meeting were read and 

 confirmed. 



