on Bitumen in stones. 
525 
ADDITIONAL EXPERIMENTS. 
I have again distilled felspar, and again obtained the 
volatile fluid. 
33. Carrara Marble. 
0,15 per cent, of water without smell, or alkaline mixture. 
34. Lucullite , from Galway. 
0,188 per cent. ; an oily smell at first, but afterwards became 
ammoniacal. Litmus paper reddened by acetous acid be- 
came blue. Vegetable blue paper became green. 
The contents of the retort white, except at the upper part, 
where there was a carbonaceous appearance ; no efferves- 
cence, nor smell of sulphuretted hydrogen when put into 
dilute muriatic acid. 
The distillations in iron retorts. 
In a former distillation of Lucullite, in which the lime 
was not rendered quite caustic, muriatic acid in dissolving 
the residuum produced a smell of sulphuretted hydrogen. 
%* I am obliged to Sir Charles Giesecke, for the Greenland specimens ; to 
Mr. Griffith, for those from Arran, Carlingford, and Castle Wellan ; and to Mr. 
Moore, for the fetid quartz. 
The stones were all ignited in a platina crucible. 
