s86 
Mr. Hatchett’s Analysis of 
pertaining to the mineral kingdom. Mr. Jacquin, in 1781 
and 1786, gave to the public an account, from the Abbe Wul- 
fen, of a yellow sparry lead ore, found at Villach in Carinthia;* 
and the Abb6 Wulfen himself, in an elaborate work, written 
in the German language, and published in 1785, also described 
the abovementioned lead ore, together with some experiments 
which had been made on it.-}' 
Nothing satisfactory, however, relative to its nature was ex- 
posed in these memoirs ; and although the substance was in- 
disputably proved to be an ore of lead, yet the mineralizing 
principle of it remained unknown. 
In 1790, Mr. Heyer, of Brunswick, made some experiments 
on this ore, from w'hich he inferred that it was composed of 
lead, combined with the tungstic acid:J and in the same year 
Mr. Klaproth communicated to Dr. Crell a similar ac- 
count, which he had received from Mr. Salzwedel, of Frank- 
fort sur Mayne.§ 
This substance was therefore universally believed to be a 
tungstate of lead, till that excellent chemist Mr. Klaproth 
undertook to subject it to a farther examination ; and as the 
experiments which I have made may be regarded as a conti- 
nuation of those made by Mr. Klaproth, I think it necessary 
here to mention them. 
* Nicolai Josephi Jacquin Miscellanea Austriaca, Tom. II. p. 139; e t N. J. 
Jacquin Collectanea, Tom. I. p. 3. 
This ore is also described in Lithopbyl. Bornianum, Tom. I. p. 90 ; et Tom. II. 
p. 123. — Karsten in Mus. Lesk. Tom. II. p. 501. — Werner’s Verzeicb. Band, I. 
p. 128.— Raab’s Catal. Tome II. p. 379. — Rome de VIsle Cristal. Tome III. p. 
387. — Widenmann’s Handbuch der Mineralogie, p. 864. 
f Xavier Wulfens Abbandlung vom Karnthnerischcn Bleyspate. Wien, 1785. 
J Cbemiscbe Annalen von Crell, 1790, p. 58. 
§ Ibid. 1790, p. 297. 
