70 A. LIVERSIDGE. 
On tHe CRYSTALLINE STRUCTURE or GOLD anp 
PLATINUM NUGGETS anp GOLD INGOTS. 
By A. LIveRsIpGE, LL.D., F.R.8., 
Professor of Chemistry in the University of Sydney. 
[With Plates I.-XVI.] 
[Read before the Royal Society of N. S. Wales, October 3, 1894.] 
A preliminary account of the subject of this paper were com- 
municated in 1894 to the Royal Society of N. S. Wales, and the 
sections of some nuggets were exhibited then and later on, but 
the publication of the paper has been deferred until now, pending 
the preparation of the illustrations; a brief notice from the 
proceedings of the Society was also published in the Chemical 
News in 1894. 
In a paper read before the Royal Society of N. S. Wales in 
1893,? I discussed the origin of gold nuggets and reviewed the 
theories which had been put forward to account for their forma- 
tion. One explanation of their origin is that they have been 
formed in situ in the gravels and alluvial deposits in which they 
are found, and that starting with a nucleus they were gradually 
increased in size by the successive deposits of gold from solution, 
2.¢., that they were built up of superimposed coatings and were 
analogous in structure toan onion. In that paper I gave various 
reasons to show that this explanation is not justified; after its 
publication I obtained specimens of gold nuggets, which were 
ground down or sliced through so as to obtain sections; these 
sections were then polished and etched by means of suitable 
1 It has been arranged that this paper should be published simultane- 
ously in the Journal of the Chemical Society, London.—A.L., Sydney, 
July, 1897. 
2 On the Origin of Gold Nuggets.—Journ. Roy. Soc. N.S.W., 1893; 
Chemical News, Vols. xix. and t., 1894. 
