Book Notices. 147 
MEE os ea ee 
| tions that a delicate black precipitate is produced when the hydrogen from zinc is 
4 passed through nitrate of silver; this precipitate was probably sulphid of silver, and 
| not metallic silve er, as Karsten cues ure 
j gain, Jacquelain, in the memoir already referred to, bites that sulphur 
as not contained in the speciiien of French zine which he examined, because a com- 
ie! 
me 
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= 
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£. 
Ss 
=. 
oS 
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<i 
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rp 
9,6 
S 
= ° 
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Fe 
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= 
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boned 
z 
FE 
e 
8 ‘alle paper, Jac seine slab: criticiain the observation reported by Fordos and Gélis 
vf the generation of sulphuretted hydrogen from zine and dilute sulphuric acid, im- 
plies that there is no sulpbur in zine by stating that the development of sulphuret- 
avoided i i 
to be wondered at, but it is not ri argued from this fact, flint there is no ag 
: 
Tg 
rey 
os 
co 
a) 
A vigorous evolution of re ins hydrogen was the immediate re- 
phur in zine, ith regard to sulphur in the ie from New Jersey, Alger* has re 
: earkes that the New Jersey zine ore is known to contain no sulphur; but, on the 
: r hand, Jackson+ observed the sulphuret of zinc in the fanen of red oxyd of 
; ion in Fr anklin, Sussex County, New Jersey, and a simple experiment demonstra- 
; o us the existence of sulphur in that ore. 10 or 15 wee i s of the red oxyd 
| of zinc, not ent ly free the ae. of carbonate of lime in which the ore oc- 
: curs, were reduced to a fine e powder, a reated with moderately dilute pure sul- 
sl 
e have vere purposely — any allusion to “ valuable discus- 
sion upon the occurrence of arsenic in zinc into whic the authors have 
been drawn, since we pune to cite their neh es upon this subject in 
~— in a subsequent number. 
. A Practical Treatise on Coal, Petroleum, and other distilled Oils ; 
Awnanan GEsn NER, M.D., BGS. New York. Bailliére Brothers 
congene 
contribution to the recorded technology an an obscure lamin it. is ne - 
paid in advance. as the 
pie sea st Proc. Am, Association, 1850, iv, 336. 
