Blowpipe Experiments. 201 
3. Pyroligneous Acid.—Mr. a a surgeon of Kasan, 
a frequent y used this acid in the cu hagedenic ulcers 
of the feet, and with constant sdecatins he surface of the 
ulcer is washed once a day with the acid by means of a fine 
brush or hair pencil, and then covered with lint, and a diges- 
tive ointment. The bad smell of the ulcer soon ceases, the 
‘Sanies loses its corrosive nature, a good pus is formed, and a 
healthy action is rapidly induced.— Bul. Univer. Feb. 1824. 
44. Chlorate of Potash, according to Dr. Geiger, may be 
obtained more abundantly by exposing the solution of sub- 
carbonate of potash, saturated with gaseous chlorine, in a cool 
place during several days.—Jdem, Mars 1824. 
45. Test for Iron.—Ficinus, of Dresden, pretends that mu 
riate of gold is preferable as a test for Iron, to all others hith- 
erto employed. It is well to adda little carbonate of soda to 
the liquor suspected to be ferruginous —Idem. 
46. Excellent test for Copper by Wittinc.—After having 
dissolved a grain of stilphate of copper in 24 ounces of dis- 
tilled water, the author dips into it a fragment of phosphorus 
suspended by a thread. A blue colour is soon manifest, and 
at the end of a few hours there is a brown deposit on the sur- 
face of the phosphorus, sufficient to leave no doubt of the 
presence of copper, ees it existed in the liquid only in the 
porportion of 5;455-—ddem 
47. Blowpipe Fraperenents< vd 09 difficulty of gulps ing 
very small particles of a mineral to the actio n of the 
pipe is much increased by the want of a aueiia ae for 
such small portionsof matter. J. Smithson has prescribed an 
excellent method. He flattens the end of a platina wire, and 
spreads over ita little paste made of porcelain, or pipe clay and 
bai and apis? this to the powder or particle to be acted 
on. It dries and adheres in a few minutes, and may then be 
fully cane to the flam 
If the clay should affect the desired action of the flame un- 
favourably, a paste may be made in many instances of the fine 
Voi. [IX.—No. I. 26 
