HISTORY OF PRUSSIATES. QAQ 



thnt which I had brought by subsequent operations to that 

 colour, semitransparency, and fracture, which indicate its 

 greatest purity. 



Perhaps We may infer fforri this, that the* impurity of Brown phos- 

 brown phosphorus does not arise, as some have supposed, ghorus perhaps 

 from a portion of carbon carried over by the phosphoric va- n^pSyfar- 

 pours. In fact, if the smallest portion of carbon, burned b o«. 

 with sulphur, immediately communicate to its flame pro- 

 perties absolutely different from those of the flame of pure 

 sulphur, analogy leads us to expect similar effects from car- 

 bon incorporated with phosphorus. But I found nothing of 

 this in the combustion of brown phosphorus. I arn free to 

 confess, however, that this is an argument of no great 

 weight, particularly as the most essential point of compari- 

 son is still wanting, for I have never been able to succeed in 

 burning together phosphorus and charcoal mixed in different 

 proportions. 



(To be concluded m onf next.) 



II. 



Facts toward a History of Prussiates. By Mr. Proust, 



(Concluded from p. \0Q.) 



Some Precipitations by the Simple Prussian*. 



JL HIS prussiate, with the metallic solutions, gives diiTe- Precipitates 

 rent results from the triple prussiate, some of which had with the sim 

 already been noticed by Scheelfe, The following are those I p^Jsktefdif 

 have observed. fer. 



Silver, with the triple prussiate, gives a white precipitate, silver 

 which soon turns blue, in consequence of the white prussiate 

 of iron mixed with that of the silver. 



With the simple prusskte it produces a white curd, that 

 does not change. 



Gold is not affected by the triple prussiate. Gold. 



Vot. XVI.— August, 1807. S With 



