322 Dr . Priestley’s Experiments and Obfervations on 
This liquor was nearly colourlefs, but contained a large 
quantity of a light brown fediment. 
Exp. i. 2. 3. 4. 5. 8. 9. Similar to thofe of § 1. and n. ex- 
cept the different colour of the precipitates, and that 
made by the phlogifticated alkali being a fine 
blue. 
10. The liquor faturated with vegetable alkali b eing 
flowly evaporated to drynefs, and the precipitat es 
mixed with the brown fediment being put into a 
retort, fome concentrated vitriolic acid was added, 
and heat was applied. A very faint fmell of nitrous 
acid arofe, but no vifible red vapour; nor did any 
thing diftil into the receiver until the heat was very 
confiderable. 
11. The liquor then diftilled was evidently acid ; but 
this acid was wholly precipitated by terra ponderofa 
lime water. 
.§ V. 
Feb. 19. Having now received a larger quantity of the liquor 
and fediment, produced as § 1. viz. 329 grains of the bluifh 
green liquor, and 1 2 grains of the reddifh brown fediment, I 
proceeded to repeat the experiments, but the refults correfpond- 
ing with the former ones, I need only mention, that the liquor 
changed litmus red, and coagulated it; that with phlogifti- 
cated alkali it gave a browni/h red, and with cauftic vegetable 
alkali a blue precipitate; that after fatu ration with the vege- 
table alkali, both the dried fait and the fediment being fub- 
mitted to diflillation with the addition of concentrated vitriolic 
acid, an orange-coloured vapour inftantly arofe, and the pecu- 
liar fmell of nitrous acid was firongly perceived. The diftilled 
liquor, 
