346 A. LIVERSIDGE. 
ated by faces of the tetrakis hexadron (2% On), the striations of 
the prisms being due to oscillatory combinations of the cube 
(« Ooo ) and four faced cube (~ On), 
A hexagonal prism of gold closed at both ends by a hexagonal 
pyramid is said to have been found at New Bendigo; this may 
have been a pseudomorph after quartz.—(Selwyn and Ulrich, 
Phys. Geog. Geology and Mineralogy of Victoria, Melbourne 1866). 
Prof. Chester described some hexagonal crystals of gold (Am. 
Journ. Sci. 3rd Series xvi. p. 32), but as they consisted of an 
amalgam containing 6°/ of mercury, they can hardly be cited in 
support of the apparent hexagonal nature of the crystals obtained 
on the sulphides by reduction. 
Prof. Egleston states that petroleum throws down hexagonal 
crystals of gold from gold chloride. 
The crystals obtained by me up to the present are unfortunately 
very small and require further investigation, it may also prove to 
be that the hexagonal plates and stars are incipient cubical forms 
or even gold containing sufficient foreign matter to afféct its 
crystallisation. 
I hope to have an opportunity to lay before the Society the 
results of some further experiments upon the formation of these 
hexagonal crystals as soon as they are completed. 
GOLD MOIRE-METALLIQUE. 
‘By A. LIvVERSIDGE, M.A., F.R.S., 
Professor of Chemistry, University of Sydney. 
[Read before the Royal Society of N. S. Wales, September 6, 1893. | 
In experimenting upon the reduction of gold from solution, to 
test the theories of the formation of gold nuggets, I found that 
the pure gold plates and foil which I used (as described in another 
paper, see p. 327), in many cases presented a moiré-métallique 
appearance, such as is so familiar to us in tin plate and galvanized 
