5 24 
The Right Honourable George Knox 
2 6. Mica Slate. 
Ignited ; lost 2 per cent, and colour heightened. 
Distilled ; a bituminous water very volatile, but no trace of 
ammonia ; part of the product lost. 
Residuum in the retort a heavy pumice, which broke as No. l . 
27. Mica, Silver-white. 
Distillation produced 1,33 per cent, of bituminous water, 
with indications of ammonia. The contents of the retort was 
slightly coherent. 
28. Fetid Quartz. 
By ignition lost 0,937 per cent, and its smell. 
Distillation produced a bituminous water, smelling strongly 
of naphtha, but in which neither ammonia nor sulphuretted 
hydrogen could>be-traced. 
29. Pearl-white Common Quartz Fat Quartz. 
Ignition gave 1 per cent. loss. 
By distillation 0,1 of a very fetid bituminous water. 
Contents of the retort a powder unaltered in colour. 
30. Rock Crystal. 
By ignition lost nothing ; the specimen was perfectly trans- 
parent and colourless, the powder snow-white. 
31. Adularia, a Crystal, Pearl-white. 
By ignition lost nothing. 
32. Pearl-blue Adularia, from Greenland. 
By ignition lost 0,4 per cent. 
All these substances, with the exception of the Rock Crystal 
and Pearl-white Adularia, scintillated more or less strongly 
when projected on boiling nitre. 
