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194 - Bibliography.  —~ 
Let the whole stand in a warm situation over night, and when the pre- 
cipitate has all subsided, filter on double equal filters, collect and wash 
the precipitate with distilled water. ‘After carefully collecting and 
weighing the residuum, it may be decomposed by deflagration with 
nitre, solution in nitric acid, and precipitation of the deutoxide of cop- 
per by boiling potassa 5 or otherwise by a current of hydrosulphuric 
acid gas, passed through distilled water, in which the apocrenate is 
previously suspended. Either of these methods gives a brown solution, 
after filtering, which is apocrenic acid, and may be evaporated on the 
air-pump, in a capsule of thin glass of known weight, and subsequently 
weighed, subtracting the weight of the capsule. The crenic acid still 
remains in the mother'water; to obtain it, render the solution alkaline 
by carbonate of ammonia; heat it to expel all carbonic acid, and then 
drop in acetate of copper; the crenate of copper falls asa greenish 
white precipitate; treat it like the foregoing, and decompose it by 
hydrosulphuric acid gas; filter and evaporate as before in a thin glass 
capsule 5 a brownish yellow substance adheres to the sides and bot- 
tom of the glass, and on drying, scales up in brilliant chips. These 
substances, when tested as Berzelius directs, for the discovery of cre- 
nic and apocrenic acids, give results identical with those which he ob- 
tained. 
There are many practical and very important observations on ma- 
nures and composts, and the use of peat in particular as a prominent 
ingredient of composts. But we have already exceeded the space we 
proposed to devote to this notice,—and we congratulate the State of 
Rhode Island, as well as the author, on the great amount of valuable 
and interesting information which well directed industry has accumu- 
lated, in so short a time as one year. The best earnest for the con 
tinuance of governmental patronage to labors of this class, is found 
in the zeal, fidelity, and usefulness of the performance- 8. Jr. 
Yale College Laboratory, Jan. 1, 1841. 
14. History of Embalming and of Preparations in Anatomy, 
Pathology, and Natural History, including an account of. & 
process for Embalming ; by J. N. Gannat, Paris, 1838. Trans 
lated from the French, with notes and additions, by R. Harlan, M. D. 
Philadelphia, Judah Dobson, 8vo. pp. 264. 
_The art of embalming, as practiced by the Egyptians, h 
many other arts of that ancient people, fallen into oblivion, and the 
progress of enlightened civilization has rendered this loss of conpy 
tively little consequence, if we view the practice only asa mode 
complying with the requisitions of heathen superstition. 
ence of anatomy has long stood in need of some mode, more oir 
than any heretofore used, of preserving from speedy decay the subje? 
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as, like 
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