122 Scientific Intelligence. 
For example, the salts of cyanid of mercury bi the chlorids of 
niokel and cobalt, to which Poggiale* gives the form 
NiCl, HgCy, 6HO 
2COCl, HgCy, 4HO 
I have found to be expressed by 
NiCl, 2HgCy, 7HO 
CoCl, 2HgCy, 7HO 
thus removing a difference which was certainly not to be expected in 
bodies so nearly related, and sROMINE their conformity in constitution 
with the other salts of this class 
The salt to which Desfosses t gives the formula 
KCl, 2HgCy, HO 
I find to contain two equivalents of water: and for the analogous salt 
with oh a Aaninen which eco to Poggiale contains but 4H0. 
I get the fo BaCl, 2HgCy, 6HO. 
- Bee ‘ieee’ in composition with the corresponding salts of Sr(l and 
The cyanid unites also with chlorids of the type R,Cl,: I have 
“eae! and analyzed the compound with perchlorid of i jron. Its for- 
e,Cl,, 4Hg Cy, 7HO. 
t aay to get similar salts as "Al atin Be, Cl, and pee with Cr,Ols; 
For the salt of cyanid of mercury and chromate of potash, first dese ribed 
‘ by Caillot and Podevin,t Rammelsberg § has found the formula 
2(KOCrO,), 3HgCy 
which was changed by —— I to 
O3, 2HgCy. 
An re of this salt has — me results agreeing very nearly dy with 
those of Rammelsberg, with the addition of one equivalent of wales 
which has been hitherto overlooked. Its ae would then 
2(KOCrO,), 3HgCy, H 
The analyses of the compound which has been oe las as consisting 
BaCl, 2HgCy, 6HO 
have shown that the composition of this salt is ait samnlgt and is not i 
exact accordance with the laws of chemical propor 
The above formula requires 16°73 Ba, and 48° fe He in the hundred 
In the salt as I have obtained it, the barium is always cgiiats in quar 
tity and the mercury in excess, The barium has been found as low ® 
13-4 and I have never found it higher than 15°69: Al the “mer 
varied from 54°3 to 50°5. In general, the smaller the excess of ch} 
of barium in the solution from which it crystallizes, the less barium, 
the more mercury will be found in the salt. In some of the cases, those 
which gave the extreme numbers, this may very probably be owing a ail 
mechanical admixture of cyanid of mercury, the crystals of which for™ 
* Compt. Rend., xxiii, 762. be Wee iq Jou. 
ae Handbuch d. 1, memoir 
a | eh, Met 261, rants aaa 
183. 
Soggy Se Loe. cit 
of 
