6iS Mr. woulfe’s Experiments to afcertain 
of the eighth, feven grains and a half; and that of the 
ninth ten grains. 
In calcining the different fpecimens of horn lilverwith 
the alkalies in the foregoing experiments, I could perceive 
no ifnoke or iinell iffue out of the phials. Hence I con- 
clude, that the horn lilver contained no arfenic; and that 
9 
none of it was dillipated during the operation. 
From the foregoing experiments it appears, that the 
horn lilver is compofed of lilver united to the acids of 
lalt and of vitriol; and that this laif is nearly one-third 
of thefe fir lh 
OF HORN MERCURY. 
1 difeovered this mineral about four years ago, when I 
was collecting minerals at Obermofchel, in the Dutchy 
of Deux Fonts. I have lince feen it in a fine collection 
abroad; but no one fufpeCted what it was until I had 
made it known, for it was taken for an infignificant fpar. 
I have found this mineral of three colours; white, and 
of a fhining brightnefs; yellow, and alfo black; this lalt 
owes its colour to a mixture of minute particles of live 
quickfilver. This fubltance cryltallizes in various forms ; 
but the cryltallization is too fmall to be deferibed with- 
out the help of a microfcope. 
EXPERIMENT X. 
I took three drams of horn mercury, picked as clean 
as pollible from the cinnabar and Itony matter to which 
it adhered, and treated it with two drams of lalt of tartar 
as 
