OF LIQUIDS IN VAPOUR. 7 



is capable of diffolving the metal. I'he coloured liquor 

 is alio heavier than that which is without colour ; and if 

 a phial of the colourlefs liquor be opened, the colour- 

 ing will begin at the top, and defcend in the form of 

 a fine thread in the center of it to the bottom, till the 

 whole be coloured. 



By means of this colourlefs folution 6 ounce meafures 

 of air were reduced to 5, completely phlogifticated, 

 without any fixed or inflammable air in it. 



Liver of fulphur difcharges this colour: 



The folution of minium, and alfo that of red preci- 

 pitate, in the marine acid is attended with much heat, 

 the former with the emiflion of dephlogifticated marine 

 acid air, and the latter without it. But when the folu- 

 tion of the red precipitate is become cool, and colour- 

 lefs, it is afterwards diffolved in this acid without any 

 generation of heat. 



The folution of finery cinder in this acid is not at- 

 tended with heat. 



The folution of minium has a beautiful yellow colour, 

 but by diffolving red precipitate it becomes colourlefs. It 

 will alfo difcharge any other colour made by a folution 

 in this acid. 



The folution of iron in marine acid acquires colour by 

 accefs of air only, and the folution of more iron, even 

 that which is rufted, will difcharge the colour. 



This coloured acid became colourlefs by diffolving the 

 black powder of mercury and lead. Much air was pro- 

 duced in this procefs, and it was pure fixed air, with 

 a fmall refiduum that extinguifhed a candle. 



An exceedingly fmall quantity of pure air is fuffi- 

 cient to reftore colour to the folution of any fubftance in 

 the marine acid. 



2. Of 



