522 The Right Honourable George Knox 
15. Bole, from Disco Island. 
Distilled in a coated green glass retort, the result was 
nearly the same as No. 7, but it contained no ammonia. 
Boiled a portion for a couple of hours in strong muriatic 
acid, filtered and evaporated. A large quantity of the mineral 
had been taken up by the acid, but no muriate of ammonia 
was formed. 
16. Hornblende, from Schneeburg, Upper Saxony. 
By ignition lost 3 per cent, and colour heightened. 
Distillation produced 0,75 per cent, of bituminous water, 
but some was lost in the process. 
17. Tourmaline, from Karorulik, West Greenland. 
Distillation produced 0,7 per cent, of bituminous water. 
The mass in the retort was a pumice, but too much indu- 
rated. The stone was velvet-black, the powder ash-grey, 
and the pumice pearl-white. 
18. Augite,from Arendal. 
By ignition lost 0,5 per cent. 
Distillation produced 0,35 of bituminous water, chiefly 
bitumen. The contents of the retort, a powder. The heat 
was not very great. 
19. Common Serpentine, from Zoplitz, Upper Saxony. 
By ignition lost 12,5 per cent. 
Distillation produced 10,5 of bituminous water. 
20. Clay Slate, from Bangor. 
Lost by ignition, 3,25 per cent. 
Distillation produced 3 per cent of bituminous water. 
