FROM THE CRATER OF VULCANQ. 
3S1 
Phosphate of soda determined an abundant precipitate, 
corroborating the inference obtained from the phenomena 
presented by the lime-water. 
With chromic acid, chromate of potassa, muriate of tin, 
muriate of ammonia, and tincture of iodine, no new phae- 
nomena were presented ; or, at any rate, if a change did 
occur, it was not appreciable. 
Fer ro-cyanate of ammonia^ and Jerro-cyanate of potassa^ 
produced a copious pi^ussian-hlue precipitate, and therefore 
iron was held suspended in the liquid. 
With pure ammonia, the solution became turbid, and 
changed to a hrownish-green. 
Hydriodate of potassa yielded a yellow-green precipitate, 
Ferro-cyanate of potassa gave a greenish-white precipi- 
tate, with the colourless liquid which remained, after sepa- 
rating the prussian-blue by the filter. 
The three last chemical tests appear to determine the 
existence of 7iicJcel in this liquid. 
With much diluted tincture of galls, a reddish tint was 
primarily obtained ; it became subsequently darker, and 
finally attenuated into a lighter shade. 
Hydro-sulphuret cyf ammonia formed an immediate copi- 
ous green precipitate, clouded with cobweb-like films. 
The phaenomena presented by the agencies of the tinc- 
ture of galls, and hydro-sulphuret of ammonia, are such as 
would be exhibited by titanium, and, therefore, this metal 
may also be concluded upon. 
Pure potassa was mixed with the liquid undiluted, in a 
watch-glass, and a feather moistened with muriatic acid 
brought near ; the white vapours produced, determined the 
evolution of ammoniacal gas : the odour of ammonia w-as 
also unequivocal. 
Nitro-muriate of platinum dropt into the undiluted li- 
quid, in a small capsule, and allowed to evaporate spon* 
