24 Mr. Davy’s Experiments on the 
Copper formed a bright red brown substance, fusible at a 
heat below redness, and becoming crystalline and semi-trans- 
parent on cooling, and which gave a green fluid, and a green 
precipitate by the action of water. * 
The substance from manganese was not volatile at a dull 
red heat ; it was of a deep brown colour, and by the action of 
water became of a brighter brown : a muriate of manganese, 
which did not redden litmus remained in solution ; and an in- 
soluble matter remained of a chocolate colour.-f 
Tungsten afforded a deep orange sublimate, which, when 
decomposed by water, afforded muriatic acid, and the yellow 
oxide of tungster. 
Tin afforded Libavius’s liquor, which gave a muriate by 
the action of water containing the oxide of tin, at the maximum 
of oxidation. 
Silver and lead produced horn-silver and horn- lead, and 
bismuth, butter of bismuth. The absorption of oxymuriatic 
gas was in the following proportion's for two grains of each 
of the metals : for arsenic 3.6 cubical inches, for antimony 
* It is worth enquiry, whether the precipitate from oxymuriate of copper by water 
is not a hydrated submuriate, analogous in its composition to the crystalized muriate 
of Peru. This last I find affords muriatic acid and water by heat. 
The resin of copper discovered by Boyle, formed by heating copper with corro- 
sive sublimate, probably contains only 1 proportion of oxymuriatic gas, whilst that 
above referred to must contain 2. 
-j- When muriate of manganese is made by solution of its oxide in muriatic acid, a 
neutral combination is obtained, but this is decomposed by beat ; muriatic gas flies 
off, and brown oxide of manganese remains. In this respect manganese appears as a 
link between the ancient metals and the newly discovered ones. Its muriate is decom- 
posed like that of magnesia ; and its oxide is the only one amongst those long known, 
as far as my experiments have gone, which neutralizes the acid energy of muriatic 
acid gas, so as to prevent it in solution from affecting vegetable blues. 
