Chemistry. 123 
at the same time with those of the double salt, and, as I shall on another 
w Sree | + aS. ik ree 3 
occasion show, y g them. It is likewise not 
impossible that there may be a compound of chlorid of barium with more 
than two equivalents of eyanid of mercury, and that the analyses were 
made upon mixtures of the two salts. But the existence of such a body 
has never been shown, nor do we know an instance of a chlorid, 
lodid or bromid combining with cyanid of mercury in any other pro- 
portion than one equivalent to two. The salts of chlorid of nickel and 
chlorid of cobalt which I have mentioned, and a salt said, also on the 
authority of Poggiale, to be composed of 
2NH,Cl, HgCy 
are the only exceptions to this statement which I have been able to find. 
In other instances, as in that of the subjoined analysis, which was made 
Calculated. Found. 
Ba 16°73 15°69 
Cl (8°66) (812) 
2Hg 48°77 1:32 
2Cy (12°68) (13°34) 
6HO 13°17 11°53 (by difference.) 
100° 100° 
: — determination of the water upon another portion gave 6HO= 
The above is one of thirteen analyses of this salt, and is chosen for no 
other reason than that the crystals were carefully selected, and that its 
hms is vouched for by the agreement of the direct determination of 
Water with the determination by difference. 
“ployed in the analysis of the double salt; the result differed from the 
. 
perfect normal salt is unmistakable ; 
a ener Ystalline structure of the body is considered. 1 
BS been abnormal composition in the salt of chlorid of strontium, 
Mla yar salt of chlorid of potassium, for example, even when crystal- 
‘ hams most confused manner, has a composition agreeing completely 
i ia) a 
pos tving further discussion for another occasion when the subject shall 
Tam more thoroughly investigated, the following is the view which 
of gi at present inclined to take of this, as well as of some other 1 
“milar nature, 
