PROCEEDINGS. 217 



I need hardly say that any services which it may be in my power to 

 offer, are at the disposal of your Society. 



Believe me, yours very truly, 

 M. FOSTEE. 

 To Prof. A. Liversidge, F.E S., &c, Hon. Secretary, 

 Royal Society of New South Wales." 



" Government House. Sydney, N.S.W., 

 2b" September, 1887. 

 Sir, 



I am directed by His Excellency the Governor to inform you that 

 the address to the Queen congratulating 1 Her Majesty upon the 50th year 

 of her reign, from the Eoyal Society of New South Wales has been duly 

 received, and the Secretary of State has been commanded to convey to 

 you Her Majesty's thanks for the loyal congratulation expressed in the 

 address. 



Her Majesty has been pleased to notice particularly the tasteful binding 

 of the address. 



I have the honour to be, Sir, 



Your obedient servant, 



E. W. WALLINGTON, 

 Priv. Sec. 

 The President of the Eoyal Society." 



The conclusion of the paper upon "The origin and mode of 

 occurrence of gold-bearing veins and of the associated minerals," 

 by Mr. Jonathan Seaver, C.E., F.G.S., was, in the absence of the 

 author, taken as read. 



The following papers were read : — 



1. " On some New South Wales Tan-substances," Part 3, by 

 Mr. J. H. Maiden, F.R.G.S. The Chairman in conveying the 

 thanks of the Society, expressed the hope that the result of Mr. 

 Maiden's valuable exertions would be the means of exciting more 

 interest in the commercial industries using tan-substances. 



2. " On Port Jackson Silt-beds," by Mr. Fredk. B. Gipps, C.E. 

 The thanks of the Society were accorded to Mr. Gipps for his 

 valuable paper, the Chairman remarking that the facts brought 

 before the Society by Mr. Gipps were astonishing to him, as he. 

 had no idea that such an enormous filling-up of the harbour had 

 taken place and was still continuing. He thought the facts were 

 such as to challenge further investigations by the Government or 

 Harbour Trust. 



Exhibit. 



Prof. Threlfall exhibited several pieces of Physical apparatus, 

 recently constructed at the University : — a set of 40 Clark cells 

 made acccording to Lord Rayleigh's directions ; these cells had 

 been in operation for about a year and were quite as good as ever: 

 tbe variation of the cells as compared with one taken as standard 

 were of the order of -0001 volt. A set of four hundred and fifty 

 copper zinc couples slightly modified from a description of a similar 



O- October 5, 1887. 



