on a PFax-like Substance from Madras. 391 
cubic inches of gaz. In the retort there remained 3 7 grains of 
carbonaceous matter, which was a pretty hard cinder, the un- 
der surface of which in contact with the glass had seemingly 
undergone a partial fusion, and the glass itself to which it ad- 
hered appeared to have been a little corroded. 
The above distilled gaz contained no oxygen to the test of 
nitrous gaz ; but 32 cubic inches of it were absorbed by milk of 
lime, and near 86 cubic inches of it were absorbed by yellow 
oxyd of lead, or massicot, placed in the focus of a lens; 
during which absorption lead was reduced, and water com- 
posed. The remainder of the gaz extinguished flame, and 
was concluded to be nitrogen or azotic gaz. 
The gaz which was obtained by distillation was therefore 
a mixture of carbonic acid, hydrogen, and nitrogen gaz. This 
mixture burnt like what has been called heavy inflammable 
air. 
The above 3 7 grains of carbonaceous matter afforded two 
grains of muriate of soda, one grain of carbonate of soda, four 
grains of phosphate of soda. The lixiviated carbonaceous 
matter being mixed with 300 grains of red oxyd of lead, and 
exposed to a due degree of fire, yielded about 60 cubic inches 
of carbonic acid gaz, and a little regulus of lead ; but there was 
a residue of carbonaceous matter which could not be burnt 
away in the fiercest fire in open vessels. This residue was 
probably carbon, phosphoric acid, and soda, intimately mixed 
by fusion. 
From this analysis, it appears that 100 parts of white lac pu- 
rified yield 
