328 = T. Parkman on action of Sulphur and Phosphorus 
Arr. XXXI—On ¢ Se ee 
Phosphorus Groups on solutions of the metals; by THEO 
PARKMAN. (Abridged tite his Inaugural Dissertation, "Git 
tingen.) 
THE subject of the following dissertation was suggested by 
an observation made in the laboratory of Prof. Wéhler, at Gat 
tingen. In precipitating selenium, by sulphurous acid, from a 
solution which contained considerable copper, the selenium ob- 
tained was black, although the precipitation took place in 
cold. On investi ri 
As just mentioned, precipitated selenium, placed ina solution of mt 
phate of copper containing sulphurous acid, unites with copper. I find 
i cee arsenic and antimony all do the 
same. In most cases also, the same effect is produced, especially with 
the aid of feos without the presence o of sulph urous anid or other redu- 
og oe have also extended the i shag santa though less bar a 
ie at jetta: and lead. With the exception of the action of phos- 
ae and — iphigeak: all these reactions appear 
ave been previ nil salle 
1. Action of sulphur aa the aid of reducing agents. —Precipitated 
sulphur and flowers of sulphur were left a week in solutions of sulphate, 
acetate and chlorid of copper. At the end of that time, they were i 
tirely unchanged. Precipitated foreseen boiled five or sid al with : 
Sulphur, * left three doped in solution of nitrate of silver, vane and 
Oe Boiled i in solution of nitrate of silver, it became rapidly ly black “led 
: be entirely converted into sulphid of silver. Sulphur, bo 
-ospoaally? har iit ead opp became dark grey- 
, 2 Action of sulphur with the aid of reducing agents. ca re 
