298 Analysis of an Hydrate of Iron. 
close of the operation carbonic oxide is produced ; but the 
gas | pete, almost fo, the end, sufliciently luminous to 
be worth saving. 
_Indecidingupon | the eligibility = ppg Bes. cotton seed for 
act te is at present aceapaty aatea - any price, while coal 
is still in this country a scarce and expensive article. On 
account of the cheapness of the seed, therefore, the quali- 
ty of the gas, and the simplicity of the apparatus required 
for its manufacture, it appears not improbable that it may 
be found the most eligible substance for gas illumination, 
especially in the United States. 
Art. XXIII <a dnalyen of an Hydrate of Iron, ees Fron 
ia from Monmouth Co. New Jersey, by Henry Sey- 
T 
Tae colank of the specimen, used for the analysis, was 
deep Biot, powder reddish brown. Fr cture e resi- 
8,0 , massive, cellular, very frangib 
ble, infasibte before the blowpipe. Specific gravity 3.003. 
A portion of the mineral, by distillation, furnished drops of 
Analysis. 
A. 3 grammes of the pulverized mineral, after a strong 
calcination weighed 2,405 grammes, therefore the diminu- 
tion of weight occasioned by the loss of the water amoun- 
ted to 19.833 per 100 @ 
. The calcined inidieral was boiled with concentrated 
nitro-muriatic aeid—it nearly all dissolved, affording ® 
solution of a deep brown colour, the residue appeared 
Eectulent and colorless, the whole was evaporated to dry- 
ones ; the mass was treated with acidulated water, and by 
- flirtion 0.10 grains of insoluble residue were obtain re - 
€quivalent to 3.333 per 100. 4 
C.. The filtered solution (B) was treated 
nate of ammonia, as long asa preci itat 
ee 
the precipitate was reddish brown and flo 
