the Marine Acid. 89

gisticated air. The matter melted into ared fluid substance, which, when cold, ex-panded, and broke the retort. This resi-duum gave a yellow tinge to spirit ofsalt.

Spirit of salt dissolved a great quantity ofred precipitate, with great heat, but with-out effervescence. During the solution theacid was of a turbid white colour, and theprecipitate is generally black, though someparts of it continued red till they werequite dissolved. But what remained un-dissolved at the last was all black. After ithad subsided, all the opake matter was de-posited, and the acid way beautifully trans-parent.

This acid dissolves a great quantity oflapis caliminaris, but not the whole of anypart of it. The solution is made withoutheat, and it leaves no colour whatever inthe spirit of salt.

Spirit of silt had no effect whatever onprude antimony, on wolfram, calcined or un-palcined, or on white arsenic. It is notaffected by vermilion immediately; but in

time