ms 
Observations on Maddening , 
11 . Whether, in secondary mountains, on the other 
hand, each stone is not generally simple, and not com- 
pound as in the primitive ? 
12. To make researches respecting the origin and an- 
tiquity of mountains of gypsum, and their relation with 
mountains of salt and salt springs. 
(To he continued ,J 
Observations on Maddening ; together with a simple and 
certain Process for obtaining , with great Beauty and 
Fixity , that Colour known under the Name of the 
Turkey or Adriano fie Bed . By J. M. Haussmann* 
(Concluded from page 146.) 
The Process . 
After making a caustic ley of one part of good com- 
mon potash dissolved in four parts of boiling water, and 
half a part of quicklime, which I afterwards slaked in 
it, I dissolved one part of powdered alum in two parts of 
boiling water ; and while this solution of sulphate of alu- 
mine was still warm, to avoid re -crystallization, I spee- 
dily poured into it successively, always stirring it with- 
out interruption, the above-mentioned caustic ley, till the 
alumine it had at first precipitated after saturation to ex- 
cess with sulphuric acid had been redissolved. I left at 
rest this solution of alumine, which exhaled ammonia, 
and which, on cooling, formed a precipitate of sulphate 
of potash in very small crystals. I then mixed a thirty- 
third part of linseed-oil, with which the alkaline solution 
of alumine formed a kind of milky liquid.* As the oil 
gradually separates itself from this mixture under the ap- 
* In {act, a saponaceous liquor is formed containing alumine. Til, 
