Dr. Pearson's Observations and Experiments 
Butyraceous oil 
25 i 
Thin oil ~ “ 
5 ° 
Water containing acid - 
Carbonaceous matter, containing phosphoric 
*i 
acid, muriatic acid, and soda 
4 >i 
Carbonic acid, by estimation 
4 
Hydrogen, by estimation 
H 
Nitrogen or azote, by estimation 
10 
98 
Deficiency by waste and error, by estimation 
2 
100 parts. 
When this experiment was made with unpurified white lac, 
the proportion of water and carbonaceous matter was much 
greater than in the preceding experiment. On account also 
of the water, it was extremely difficult to prevent the sub- 
stance boiling over and bursting the vessels. 
Charcoal of wood being mixed with white lac, the oil 
seemed to distil over more readily, with less water, and was 
paler coloured oil than in the preceding experiment. 
White lac was also distilled from pot-ash, without any ma- 
terial difference in the result, excepting that the oils which 
distilled over were thicker. 
