144 Book Notices. 
lin zines, and from the zine of Rousseau Fréres, As precisely the same result was 
obtained hae 3 each of these zines, it may be stated once for all. 
i ing the mixture of residue and chromate of lead till the chromate fused 
there a appeared in each case a very slight deposit on the upper surface of the lime- 
water column in the fine tube. This deposit could not have been smaller and yet 
w 
e of car ; e i P 
rity was infinitesimal, and not at all to be compared in quantity with the lead 
and other metallic admixtures of which the residue mainly consi a ad. oa pres: 
carbo! 
baat for 
ceedingly small cloud of carbonate of lime produce ‘ 
zines is even less considerable than that detected in the New Jersey zine. 
te ; 
nearly as much carbonate of lime in the test-glass as we ° Et m the calle 
poantbie 
there is never anything more than an infinitesimal pom 
siderable residue which remains when thirty or forty pene of me geen po 
are dissol age auie a — 
_“ Against tet mmon bon is one of the principal impur es of 
zine, we would refer to the "previously ¢ pain a t of Wackenroder, ma 
carbon only an accident and mechanical impurity, and to the exact 
hur.—It ont Lon frequently —- that su mmon impurity of 
zinc, and that it even occurs in the insolu — Baer rg in na duasies with Jead. 
We — tested the: insole residue a ilesian zine for 
ne is there- 
fore free from lead, and certain! art pace no carbon or sulphur which manifest 
thémselves as an insoluble residue, The New Jersey zine i #. 
se ibis 
Ue CuniP 
he aes 
dissolved in boiling nitric acid. The partial solution gave no precipitate w Sir — as 
) 
FP 
— 
3 
B 
mn 
a 
bs = | 
= 
i=] 
= 
=) 
o 
Qo 
gg 
P-) 
“ 
oO 
~) 
2. 
a 
far] 
oO 
co 
Goes 
gees 
Ba 
= 
nm 
S. 
rete 
#59 
Eg 
all 
eS See 
v f. Mineralogie, Karsten u. Dechen, , xvi, 607. Karsten also says: i 
have nesta sheet zinc with coal for es vara and then melted it; but in te 
resulting mass of zinc 1 have found no trace of carbon.” Ibid, 608. 
BF DY eT ae ee 
