Purification of Col alt and Nickel from Bismuth, &c. 51 



hfe presently found himself refreshed, grew calmer, and all 

 the threatening symptoms began to abate. 



The next day, when the physician came, expecting to 

 find a corpse, he was struck with astonishment : his pulse 

 was already reduced from 140 to 100 strokes in the minute; 

 the ulcers had put on a more florid appearance ; he Was per- 

 fectly tranquil ; and the discharge from his eyes> nose, and 

 tars, considerably diminished. The yeast Was continued, 

 and he recovered as rapidly as he had fallen sick — so as, in 

 a few days, to be perfectly Well. 



I have only further to observe, that, as they got a pail of 

 fermenting wort into his room and skimmed the V east GfV 

 occasionally, the precise quantity he look cannot be stated; 

 but it is estimated that he took three or four table spoonsful! 

 of pure yeast in twenty-four hours. It was so far from af- 

 fecting the bowels, that it was found necessary to administer 

 some opening medicines while he was taking the yeast. 



If any persons wish to be further informed, I will give 

 them a "reference to the parties, who are people of consi- 

 derable notoriety in the city. 



I am sir, your humble servant, 



Grocer's Hall Court, J. HeAtH. 



March 20, 1804. 



Xl. On tJie best hitherto known Methods of purifying Colalt 

 and Nickel from Bismuth, Arsenic, Iron, and Copper, 

 ivhich in general accompany these Metals; hut particu- 

 larly on the lest Methods of separating Colalt from 

 Nickel, or Nickel from Colalt, in the targe Way. By 

 Dr. RichTer*. 



JivERY practical chemist so well knows how difficult it is 

 to obtain cobalt and nickel free from other metals, that it 

 is not necessary to say any thing concerning it. The author 

 of this paper is well known as an able chemist, and his si- 

 tuation as director of the manufactory of colours for the 

 royal Berlin porcelain manufactory, has enabled him to ex- 

 periment upon the subject in the large way. Our present 

 object is to give the results, which, 110 doubt, will be ac- 

 ceptable to those who are concerned in similar undertakings. 

 We shall therefore give an abstract of his paper, which is 

 as follows : 



Let the pulverized ore of cobalt be repeatedly roasteJ 



* frotti Gchlen's Xeiv Journal of Chemistry, vol. u. part i.-p. 61. 



D 2 with 



