Perchlorid of Lead. 
lead held in suspension in a solution of CaCl of 40° Beaumé. 
The liquid becomes yellow and acquires very curious properties 
Thrown into a small quantity of water, it gives a precipitate of 
_  PbCl—with excess of water a brown ‘precipitate is formed of 
= Pb0?. PbCl? +2HO+ Aq= PbO? +2ClH+ Aq. 
In this case the hydrochloric acid does not react, because of 
the excess of abi present, if there were less the result would 
be PbO? +2CIH=2HO+ PbCl1+Cl. 
The perchlorid of lead does not act upon the nitrate of bismuth, 
behaving in this respect differently from TICI* (this Journal, (21, 
xli, 107). When heated it blackens cane sugar but not elucose, 
and rae may serve to distinguish between these two kinds of 
"ead with anhydrous ether and syrupy phosphoric acid, the 
solution of perchlorid of lead thickens, and ea oily drops 
appear, which are perchloro-plumbic ether. ‘This ether readily 
dissolves gold, and as the metal is taken up dhiorid of lead sep- 
arates assuming the form of the gold employed. The perchloro- 
plombic ether readily decomposes; the products are protochlorid 
of lead and chlorinated ethers. The ease with which chlorine 
separates from it, is the cause of its solvent roe on 1 gers in 
which respect it is ae the bodies presennly to be n 
New solvents for Gold.—The perchlorids dissolve per readily 
when that metal is in the form of leaf, on account of the facility 
of their decomposition with liberation of chlorine. ereal 
solution of perchlorid of manganese be employed, the green olor 
of the manganese compound grows lighter in proportion as the 
gold dissolves, for MnCl? is reduced to MnCl, and the reac- 
tion is complete, when the liquid has exchanged its green color 
a the yellow of the solution of gold, (it is the same with ero 
MnI?).* On ye aigee the liquid, a film of gold adhe 
the vessel. The same solution added to FeOSO* fate the 
Eeepitate of gold so F ckaaataneees for its dichroism. 
< e sesquichlorids, and the sesquibromids which are easily re- 
uced—for example, the leg corresponding to Mn?03, 
portion of FeBr—dissolve sald FetT? 3 is also a good solvent for 
bolt especially in presence of ether. It is s only necessary to add 
_ asmall quantity of Fe*O0? to the ethereal solution of iodhydric 
he nascent state acts upon gold. For this reason g0 je 
upon even by iodhydriec acid in presence of ether 
a: place when only water is present. 
* This Journal, [2], xli, 107. 
Ni?0?, Co?0°; also Fe?Br® even in presence of a certain pro- a 
acid, in order to dissolve the metal. This proves that iodine in ay er 
