20 Scientific Proceedings, Royal Dublin Society. 
Gold in the Barberton District.—The Swazieland schists mostly 
predominate here, quartz-bedded veins generally carrying the 
gold. In the Steynsdorp district, gold has been discovered in a 
lode, associated with copper pyrites and carbonate of iron. On 
the Piggspeak, in Swazieland, the white sandstones and quartzite 
eontain gold. 
Swazieland.—This country lies to the east of the Transvaal. 
It is practically unexplored. Gold, tin, and other metals un- 
doubtedly exist there, but capital is not forthcoming to carry out 
the necessary exploration. 
On the Occurrence of other Metals.—At present there are no mines 
in operation for the production of the following metals, although 
they exist, viz.:—iron, lead, copper, tin, antimony, silver, and 
mercury. 
Tron.—Large deposits of magnetite and hematite are found 
in the Pretoria and Middleburg districts, but remain unproduc- 
tive. 
Lead.—Galena is found in the Machadadorp district, in the Pre- 
toria and Delagoa Bay railway country ; it contains a large per- 
centage of silver, the ore body consisting of quartz impregnated 
with galena. Galena also occurs in the Pretoria and Malmani 
districts. 
Copper.—Copper is now being prospected for in the Bronk- 
horstspruit district, and several leads of chalco-pyrite have been 
discovered. 
Tin.— Alluvial cassiterite occurs in the Embabaam, Swazieland. 
The mother lode has not yet been discovered. 
Antimony.—Antimony ore, occurring as stibnite, is found on the 
Murchison, north-east Transvaal. 
Silver.—Silver is found, combined with bornite copper ore, in 
the Pretoria district, in addition to that already mentioned. 
Mercury.—This metal has been discovered on the Portuguese 
border. 
Diamonds.—The recent discovery of diamonds in the Transvaal 
has induced me to give a short description of the diamond deposits 
of South Africa. The existence of a pipe or chimney is character- 
istic of all the diamond deposits of South Africa. The yellow 
ground in which they were first found passes, at a deeper level, 
into what is termed hard blue, or “kimberlite.” At first the 
