vr.H' METAL, COLUMlilUM. 



higher orifice of S was opened. When Che itrcam had ac 

 quired its Hill foree, bubbles of air entered the bottle, and the 

 water was quickly expelled. 



I am, SIR, 



Your humble Servant, 



WILL] AM CLOSE. 



ERRATA in the Paper on Wind Inftruments. (Philof. J. V. 213.) 



Page 217 line 23, erafe major. 



—— 219 — 44, forjtftb read fourth. 



——221 — 11, change G, a, B, into G, A, B. 



VI. 



Outline of the Properties and Habitudes of the Metallic Sukftance, 

 lately dij covered by Charles Hatchett,. F.fq. and by him 

 denominated Columbium. 



N the 26th of November laft a Paper was read at the 

 Royal Soeiety, announcing the difcovery and inveftigation of 

 the properties of what appears to be a new metal ; and as by 

 the courfe of publication it mult be feveral months before it 

 will appear in the Tranfaclions, I mall prefent my readers 

 w r ith the following outline : 

 Hiftory of the 1. The mineral was lent with fome iron ores to Sir Hans 



mineral. Sloane by Mr. Winthrop of MafTachufets, and there is there- 



fore every reafon to believe, that it came from fome of the 

 iron mines in that province. 

 External cha- 2. It is heavy, and of a dark grey nearly black ; it in fome 



ratter. mcafure-has the appearance of the Siberian chromate of iron. 



Habitudes with • 3. The nitric, muriatic, and fulphuric aeids act but verv 

 * ciJs « feebly upon the mineral ; of thefe however, fulphuric acid 



produces the greateft effect, and diliblves fome iron. 

 With potafh by 4. When melted with live or fix parts of carbonate of pot> 

 f"q fi aTma"geftion a(]l k is P artia % decompofed ; but in order to e Meet a cum- 

 in muriatic acid, plete decompofition, the ore muft be alternately melted with 

 potafh, and digeited with muriatic acid, which takes up the 

 iron. 



5. During 



