Discovery of Columbite in Chesterfield, Mass. 223 
1, eget of potash. No change. 
2G . An orange red ap tee without, a, precipitate, 
3; So rt of nut galls. The 
4. Sulphuric acid, 
fag Dep ee Fe milk white precipitate. 
7. Hydriodic acid 
8. Phosphoric acid, 
9. Chromic acid, A milk white cloudiness. 
10. Acetic acid 
11. Arsenic acid, 
12. Oxalic acid, 
13. Tartaric acid, No‘ change. 
14, Tartrate of potash. 
15. Nitrate of lead, 2 A copious, milkwhite precipitate, 
16. Nitrate of silver. not re-dissolved by nitric acid. 
If any one will be at the trouble of comparing these vari 
ous results, with those obtained by Mr. Hatchett, in his ori- 
ginal memoir upon columbium,* or with those of Dr. Thom- 
son, in his attempt to ascertain the atomic weight of cohen 
bic acid,t he can entertain no doubt that the substance just 
examined, was the columbate of soda. 
I now introduced about ten grains of the columbic acid, 
into a small gimblet hole, made in a very compact piece of 
charcoal, tonnage the orifice ri means of a ce. of the same 
substance. The cl 
ml cohen, metallic mass, of an iron grey lee and oc- 
cupying nearly the same bulk as before its reduction. It was 
with difficultly impressible by the knife, and when recently 
scraped, showed a feeble metallic lustre. Specific gravity, 
5571, It was brittle, and reducible to powder under the 
pa obtained ae precipitate. Thus there a appears 
to remain no doubt of the identity of the metal here obtain- 
ed and the columbium 
* Phil. Trans. for 1802, p. 49. 
+ First Principles o of Chemistry, Vol. If. p. 77. 
