CONDENSED GAtE», S55" 



This gas is very injurious to the machine, and on that ac-- 

 count difficult to w<ork. 



Exp. 12. Upon half a pint of oxigcn was injected one Oxigenated rra. 

 pint of oxigenated muriatic acid gas.- The refult was « "^.^igen^^affbrdt J 

 thicker fubftance which did not fo foon evaporate, and a a thicker fluid, 

 yeFIowifh mafs was left behind. 



Exp. J 3. Upon half a pint of nitrogen was injefled-one' Oxigenated mu- 



pint of oxy-murialic gas. The refult was a ftill thicker' fub- ".^'"^ ^^^ '""* 

 r J b nitrogen^ 



Uance, and the yellow colour deeper, nor did it appear to 

 aft fo powerfully upon vegetable colours. Mucii of the 

 greafe of the machine was carried down in both thefe laft 

 experiments, which formed part of the yellow refidue, and 

 yielded only to ether. 



Exp. 14. Having condenfed about a pint of carbonic acid. Receiver bure* 

 the receiver very unexpectedly burft with violence. This ^^^^^'o^* 

 circumftance I attribute to the vicinity of the furnace, and 

 i mention it to guard others againfi ftanding too near a fire in 

 thefe experiments ; nor perhaps may it be ofelefs to add 

 another precaution, that of ufing goggles, or at leaft a thick 

 plate of glafs when examining the refults. 



I now took a new receiver of three cubic inches of capa- Carbonic aci(f, 



city, and pumped in one pint of carbonic acid, and upon *"*^ °^'S^"*^f'^ 

 , / , ... . '^ muriatic aci4. 



this rather more than a pint of oxigenated muriatic acid gas. 



The union produced a light fap-green colour, but no fluid, 

 though as ufual the oil of the machine had retained chough 

 efficacy to deftroy vegetable colours. 



Exp. 15. Upon rather more than a pint of hidrogen, which Oxigenated mu- 

 avas highly elaflic, were comprefied two pints of the oxige- ^^^ j^jA' ^^^ 

 fiated muriatic gas. The refult was a light yellow-green 

 colour, and no fluid. Some fmoke or vapour feemed to iffue 

 out of the receiver upon turning the fcrew, and the gas was 

 highly deflructive of c:oIouring matter. 



Exp. 16. I now proceeded to the muriatic acid gas, and Muriatic acid 

 Upon the condenfation of a fmal! quantity of it, a beautiful S^s eafily madq 

 green coloured fubftance adhered to the fuie of the receiver, denfation. 

 which had all the qualities of muriatic acid ; but upon a large 

 quantity, four pints, being condenfed, the refult was a 

 yellowifh-green glutinous fubflance, which does not evapo- 

 rate, but is inflantly abforbed by a few drops of water ; it is 

 of a highly pungent quality, being the efience of muriatic 

 acid. As this gas eafiiy becomes fluid, there is little or no 



elafticity 



