2 =. _, 
COMBINATION LABORATORY LAMP, RETORT, AND FILTER STAND. 347 
iron. The whole surface of the plate became dotted over with 
more or less regular crystals like those often seen on tin plate, 
they are however, much more regular and rectangular in outline 
and very small, the majority being less than 1 mm. square. 
Afterwards I found that this crystallisation could be brought 
about by merely boiling the pure gold foil or plate in hydrochloric 
acid. The acid, although free from nitric acid, dissolved traces of 
the gold, probably due to a little free chlorine. 
This moiré-métallique gold may have been observed before, but 
I have not come across any reference to it. Advantage might be 
taken of it for decorative purposes on jewellery and other articles 
made of gold plate. 
A COMBINATION LABORATORY LAMP, RETORT, 
AND FILTER STAND. 
By A. LIVERSIDGE, M.A., F.R.S., 
Professor of Chemistry in the University of Sydney. 
[Exhibited before the Royal Society of N. S. Wales, September 6, 1893. ] 
THE stand, as will be seen from 
the figure, is fitted with :— 
A brass screw clamp (a) 
Two or more adjustable brass 
retort or filter rings, which can 
be placed on the rod by the 
lateral slit at (0). 
An Argand burner (c), on its 
peg (a), withregulator and copper 
chimney or shade, this is_per- 
forated so as to allow of its being 
used as a support for dishes, 
watch glasses, orcrucibles. With 
a glass chimney the Argand can 
be used forillumination purposes. 
