64> On the Warm-Springs of Firginia. 



9. The air, which rises in frequent bubbles from 

 the bottom of the spring, was collected, and then agi- 

 tated with lime-water: white flakes were produced, 

 and a white precipitate. The air extinguishes flam^. 



10. Oak leaves turn the water, very quickly, to a 

 brownish red colour. After standing all night, a rain- 

 bow-coloured pellicle is formed on the surface. 



11. The water, when boiled, loses its hepatic smell 

 and taste; but turns, instantly, milky, upon adding a 

 little of the sugar of lead. White flakes are also form- 

 ed with lime-water. 



12. Oak leaves render the water, which had been 

 previously acted upon by lime-water, and which was 

 carefuUv poured from its precipitate, almost black : 

 curdles are formed, and a very considerable ochreous 

 precipitate ensues. 



13. Green vitriol, dissolved in the water, produces 

 no sensible eflfect; but, upon adding a little lime-wa- 

 ter, a deep green is instantly struck, curdles appear, 

 and a copious precipitate takes place. The precipitate 

 which was collected by filtration, before it is quite dry, 

 is saponaceous, and stains the fingers, when rubbed 

 upon them, with a bright red. When the precipitate 

 becomes dry, a part is black, the remainder has the 

 appearance of oxyde of iron. The quantity of vitriol 

 dissolved was very small ; not more than half a grain 

 in half a pint of the water. 



