on Bitumen in stones. 
523 
The contents of the retort were coherent, but not hard, and 
broke as No. 1. 
2 1 . White Felspar , from Killiney. 
By ignition lost 0,40 per cent, colour unchanged. 
Distillation in an iron retort produced 0,35 per cent, of 
bituminous water, which gave with the vapour of muriatic 
acid indications of ammonia. 
22. White Felspar, from Killiney. 
Distilled in a coated green-glass retort, same result, but no 
appearance of ammonia. 
23. Flesli-red Felspar, from Aberdeen. 
Distilled in a coated green-glass retort, a bituminous water 
produced, but by the melting of the retort a part was lost. 
It contained no ammonia. The contents of the retort were 
pale reddish- white, coherent, but friable. 
24. Menilite,from Menil Montant. 
Distillation produced 3,75 per cent, of bituminous water, 
with some ammonia. A friable substance remained in the 
retort, which on being exposed to a stronger heat in a platina 
crucible, lost 1,25 per cent.; probably carbon. 
Ignited under charcoal it became black, but did not write. 
.j 25. Adhesive Slate. 
This was the matrix of Menilite, from Menil Montant. 
Distillation produced 18,5 per cent, of water and bitumen; 
the latter wine-yellow, and floating on the surface of the 
water. 
The mass in the retort was coherent, but friable, and broke 
as No. 1. 
