CRYSTALLISATION OF GOLD IN HEXAGONAL FORMS. 343 
proof of its presence has been brought forward (except in the case 
of sea water), for it is found in recently formed pyrites and other 
deposits, and could only have got there from solution. In sea 
water it is thought to be held in solution by iodine, but its 
condition in land waters is uncertain, it may be as chloride, 
sulphide, silicate, or other compound. 
The recently formed pyrites containing but a trace of gold 
might, in theory, eventually be wholly replaced by a mass of gold 
possessing a mammillated structure and the appearance of a 
nugget, but practically I do not think this has occurred. 
Artificial nuggets of quite large size, | am sure, could be made 
in a few years by almost any of the methods followed for obtain- — 
ing thin films of gold on sulphides, plates and particles of gold as 
detailed in this paper, and I think that in places gold is being so 
deposited at the present day, but I feel sure that the large nuggets 
have not thus been formed in situ; they have been set free from 
reefs, and any small addition of gold that they may have derived 
from meteoric water has been quite immaterial, and may be 
neglected. In the case of gold grains and dust it may be different, 
for such expose a much greater surface, and the “electroplating” 
may have had an appreciable effect in increasing the amount of 
such gold. 
On THE CRYSTALLIZATION or GOLD in HEXAGONAL 
FORMS. 
By A. LIVERSIDGE, M.A., F.B.S. 
Professor of Chemistry in the University of Sydney. 
[Read before the Royal Society of N. S. Wales, September 6, 1893. ] 
WHILE experimenting upon the reduction of gold, from a solution 
of the double chloride of gold and sodium in water, by various 
metallic sulphides, (On the Formation of Gold Nuggets, Jour. 
Roy. Soc. N. S. Wales, 1893, p. 303), I found that in certain cases 
