| 
q 
q 
i 
~ Which the tem erature is never a ; 
ie. to 122 F.]. The drying process is completed in the course of eight or 
* twelve hours, 
Technical Chemistry. 269 
ble of withstanding the most corrosive agents; it affords a material for 
filtering strong acids, and the like, as well as liquids which would be 
decomposed by-contact with the organic matter of ordinary filters, the 
excellence of which cannot be too highly extolled. 
ides employing it for removing from strong nitric acid the chlorid / 
of silver which is precipitated in the common method of purifying this 
acid by means’ of nitrate of silver, (as has recently been advised in the 
Berlin polytechnisches Intelligenz-Blatt, No. 4, . 30); Boettger affirms 
that, he has for several years past, found it of special use in filtering off 
the slimy precipitate, containing selenium, which is gradually deposited, 
gun-cotton well suited for filtering scaeedestian alkaline lyes, aqua-regia, 
and concentrated solutions of chlorid of zine, not to allude to many other 
instances, In using the cotton a small bit of it is pushed loosely, like a 
stopper, into the throat of a funnel. 
he materials which have heretofore been used for similar purposes, 
viz: garnets, asbestos, powdered glass, &c., are very much inferior, as 
filters, to the loose, fibrous gun-cotton.—From polytechnisches Notizblatt, 
1860, No. 7; in Dingler’s polyt. Journal, elv, 463. 
6. Preservation of Flesh ; by Verpett.—-Having been separated from 
Ys, or hung upon hooks, in another chamber which is warmed, but in 
the action of moisture, and from insects, the flesh thus prepared may 
theless Well to 
"sorb any moisture which the flesh may have retained. Before using 
