COMBINATIONS OF OXlMURIATIC GAS AND OXJOEN. 2g7 



nese, which did not redden litmus, i'emained in solution ; and 

 an insoluble matter remained of a fchocolate colour*. 



Tungsten afforded a deep orange sublimate, which, when tungsten, 

 decomposed by water, afforded muriatic acid, and the yel- 

 low oxide of tungsten. 



Till afforded Libavius's liquor, which gave a muriate by tint, 

 the action of water containing the oxide of tin, at the maxi- 

 mum of oxidation. 



Silver and lead produced horn-silver and horn-lead, and silver lead, and 

 bismuth, butter of bismuth. The absorption of oxhnuriatic ^'^"^"*^' ^ 

 gas was m the tollowing proportions tor two grams ot each gas absorbed, 

 of the metals; for arsenic 3*6 cubical inches, for antimony 

 • 3*1, for tellurium 2*4, for mercury I'OSf, for zinc 3*2, for 

 iron 5*8, for tin 4, for bismuth 1'5, for copper 3*4, for lead 

 '9; for silver, the absorption of volume was 0*9, and the in- 

 crease of weight of the silver was equivalent to 0*6 of a 

 grain}. ^- 



In acting upon metallic oxides by oximuriatic gas, I Action of oxi- 

 found that those of lead, silver, tin, copper, antimony, bis- ^tdcs^^***^^ 

 muth, and tellurium, were decomposed in a heat below 

 redness, but the oxides of the volatile metals more readily 



♦ When muriate of manganese is made by solution of its oxide inmu- Effect of ox- 

 riatic acid, a neutral combination is obtained, but this is decomposed by ^de of manga- 

 heat ; muriatic gas flies off, and brown oxide of mangginese remains. In "^^® on mun- 

 this respect manganese appears as a Jink between the ancient metals and 

 the newly discovered ones. Its muriate is decomposed like that of mag- 

 nesia ; and its oxide is tlie only one amongst those long known, as far as 

 xny experiments have gone, wnich neutralizes the acid energy of muriatic 

 i»cid gas, so as to present it in solution from affecting vegetable blues. 



t The gas in these experiments was not freed from aqueous va- 

 pour, and as stopcoks of brass were used, a little gas might have been 

 absorbed by the surface of this metal, so that the processes offer only ap- 

 proximations to the composition of tbeoximuridtes. The processes on 

 lead, tellurium, iron, antimony, copper, tin, mercury, and arsenic, were 

 carried on in three successive days, during which the height of the mer- 

 cury in the barometer varied from 30'26 inches to 30-15, and the height 

 of that in the thermometer from 63-5 to 61 Fahrenheit. 



The experiment on sil-^jer ^sls made at the temperature of 52 Fal)ren<> 

 heit, and under a pressure equal to that of 29*9 inches. 



X This agrees nearly with another experiment made by my brother, Mr, 

 John Davy, in which 12 grains of silver increased to 15*9 during their ' 



conversion into horn-silver. ;^ ^ . '''Ifflp 



Q5*^ than 



