Blowpipe Experiments. 201 



43. Pyroligneom Acid. — Mr. Schultze, a surgeon of Kasan, 

 has frequently used this acid in the cure of phagedaenic ulcers 

 of the feet, and with constant success. The surface of the 

 ulcer is washed once a day with the acid by nneans of a fine 

 brush or hair pencil, and then covered with lint, and a diges- 

 tive ointment. The bad smell of the ulcer sojn 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. — Idem, 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 add a little carbonate of soda to 

 the liquor suspected to be ferruginous — Idem. 



46. Excellent test for Copper by Witting. — After having 

 dissolved a grain of sulphate 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, though it existed in the liquid only in the 

 porportion of 3 slo o- — ^dem. 



47. Blowpipe Experiments. —The difficulty of subjecting 

 very small particles of a mineral to the action of the blow- 

 pipe is much increased by the want of a suitable support for 

 such small portions of matter. J. Smithson has prescribed an 

 excellent method. He flattens the end of a platina wire, and 

 spreads over it a little paste mtde of porcelain, or pipe clay and 

 water, and applies this to the powder or particle to be acted 

 on. It dries and adheres in a few minutes, and may then be 

 fully exposed to the flame. 



If the clay should affect the desired action of the flame un- 

 favourably, a paste may be made in many instances of the fine 



Vol. IX.— No. I. " 26 



