L. I. Igelstrim on bituminous Gneiss in Sweden. 39 > 
lusite. When beaten with the hammer, it emits a bituminous 
smell, like anthraconite, and also when heated by the blowpipe 
e 
crucible of platinum, I was not able completely to burn the 
whole of the bituminous substance, even after adding nitric 
acid several times; a little coal always remaining unconsumed, 
The loss of weight, however, was 1203 per cent; the ashes 
were gray. When heated in a retort of thin iron, twelve pounds 
emitted much combustible gas, while a yellow combustible 
oil, as well as a colorless incombustible fluid, was collected in 
the receiver. When the gas was allowed to escape through a 
hole of one inch in diameter a fine and bright flame was ob- 
tained during four hours: during the fifth and sixth hour the 
flame grew more blue and fainter. The powder in the retort 
_* When weighed in the hand, it feels very light compared with silicates in : ee 
