on Bitumen in stones. 
519 
When distilled, the product was 2,5 of water and floating 
bitumen. The substance remaining in the retort was like 
No. 1, a soft pumice, and broke in the same manner. 
3 . Pumice. 
Fused without loss. 
4. Amygdaloid, from Disco Island. 
Lost by ignition 3,25. 
The product of distillation was a bituminous water weigh- 
ing 3,1 per cent. 
5. Basaltic Green-stone. 
This is the Green-stone which forms beds in granite near 
the Newry Pitch-stone, and which I mistook for basalt. The 
beds contain spheroidal concentric balls, as mentioned in my 
former Paper, and the specimen operated on was from one of 
those balls. 
It lost by ignition 6 , 25 per cent, and produced by distilla- 
tion, after the water had been expelled by a heat below red- 
ness, 1,75 of pure bitumen. 
6. Transition Green-stone, Carlingford. 
Lost by ignition 2 per cent. Distillation produced 1 ,5 per 
cent, chiefly bitumen. 
7. Bole. 
Lost by ignition 24,5 per cent. The colour changed from 
Isabella-yellow to tile- red. 
A considerable quantity of bitumen was produced by dis- 
tillation, but in consequence of an accident it could not be 
ascertained. It had a saline taste, reddened turmeric paper, 
and, when presented to the vapour of muriatic acid, dense 
fumes were formed. 
