QOR Analysis of an Hydrate af tn 
close of the operation carbonic oxide is produced. but the 
gas continues, almost to the end, sufliciently luminous to 
be worth saving. 
In deciding upon the eligibility of employing cotton seed for 
the manufacture of gas lights, it should be recollected that this 
article is at present scarcely rated at 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. XXIII1.—Analysis of an Hydrate of Iron, (Bog Iron 
Ore,) from Monmouth Co. New Jersey, De Henry Srr- 
BERT. 
THE colour of the specimen, used for the analysis, was 
deep brown, powder reddish brown. Fresh fracture resi- 
nous, opake, massive, cellular, very frangible, almost fria- 
ble, infusible before the blowpipe. Specific gravity 3.003. 
A portion of the mineral, by distillation, furnished drops of. 
water. 
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. 
B. The calcined mineral was boiled with concentrated 
nitro-muriatic acid—it nearly all dissolved, affording a 
solution of a deep brown colour, the residue appeared 
flocculent and colorless, the whole was evaporated to dry- 
ness ; the mass was treated with acidulated water, and by 
filtration 0.10 grains of insoluble residue were obtained, 
equivalent to 3.333 per 100. 
C. The filtered solution (B) was treated with subcar- 
bonate of ammonia, as long asa precipitate was produced ; 
the precipitate was reddish brown and flocculent—it was col- 
