Scientific Intelligence. — Chemistry. 411 
Baden. The slag was from a furnace where pear-ore ( bohnerz ) was 
smelted, and analysis proved that this ore of iron contained a 
minute portion of titanium. Dr Wollaston, as is well known, 
was the first who described these cubes. They occur in the 
slags of iron-forges in Wales, in those at Bradford in Yorkshire, 
Alfreton in Derbyshire, at Pointzpool in Monmouthshire, in 
Clydesdale in this country, and we have no doubt will be met 
with in many other places where our common iron-ores are 
smelted. 
8. Selenium in Volcanic Sulphur and Iron Pyrites. — In our 
last Number we stated that Stromeyer had discovered selenium 
in the volcanic sulphur of Lipari ; we may now add, that this 
sulphuret is the red substance found in the Lipari Islands, 
which used to be considered as sulphur coloured by oxide of 
iron. Selenium occurs also in some varieties of iron pyrites. 
9. Bitumen in Native Sulphur. — It would appear from a 
series of experiments by Vauquelin, in the Annales de Chimie et 
de Physique , vol. xxv, that most native sulphur contains a small 
portion of bitumen. 
MINERALOGY AND GEOGNOSY. 
10 . Jeffersonite not a new species. — Dr Troost, in an interest- 
ing memoir on the Augites (pyroxenes) of the United States 
of America, in the first part of the third volume of the Jour- 
nal of the Academy of Natural Sciences of Philadelphia, shews 
that the mineral described as a new species under the name of 
Jeffersonite by Professor Keating, is a true Augite. Keating, he 
remarks, was led into error, by mistaking the base of the primi- 
tive form for one of its sides. Dr Troost names this variety 
Foliated Augite. 
11 . Maclureite not a new Species. — Dr Torrey and Mr Nuttall, 
two active and intelligent American naturalists, some time ago 
named a supposed new mineral from Brandywine, Maclureite , 
in honour of the distinguished President of the Academy of 
Sciences of Philadelphia. In a memoir published in the first 
part of the third volume of the Journal of Natural Sciences of 
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