334 T. Parkman on action of Sulphur and Phosphorus 
sulphate of copper, for a long time, did not take up any copper. Boil 
with acetate of copper, however, it was found to have united with con- 
siderable copper 
For analysis ‘of the product of this last reaction, red selenium was — i 
boiled several hours with acetate of copper, thoroughly washed, and dried 
in vacuo. The substance obtained was a black powder, mixed with hard 
lumps, which, when broken, had a ticle metallic lustre. For analy- 
sis, it was dissolved i in nitric acid, the oxyd of copper precipitated, at the 
boiling point, by caustic potash, washed, dried, and ignited with saltpetre 
and carbonate of potas 
0°5237 grm. oh ia gave 0°0507 oxyd of copper. 
agen Maer 
Cu, - - - fe 
Se (by difference), 92°27 9°7 
100-00 
Hence it would seem that the selenium was only partly converted into 
selenid of gopper, notwithstanding that the boiling was kept up five 
hours, or pore 
Red selenium, left four days in solution of nitrate of silver, gave & 
black ia along with a few white flakes of (probably) scheme acid. 
After dissolving out. the latter by means of caustic soda, the b ack et es 
der was found to contain selenium and silver, both in — qu wie | 
No free selenium could be seen in it, by the aid of the lens. (See 
marks on the action of tellurium on nitrate of silver.) 
Red selenium, boiled a long time with acetate of lead, took up 00 lead. 
2. With the aid of reducing agents.—As already m menignned, red sele- 
nium, with sulphate of copper and ees acid, becomes i, 
through formation of selenid of copper. 
For analysis, a portion was prep n the same manner as the co 
little selenious acid being usually precipitated, along with the oxyd 7 
copper. an the copper in the following analysis com es ou 
somewhat too high. } 
20735 grms. substance gave 0°8336 oxyd of copper. 
: Calculated. Found. 
ou, Oe 61°61 62-00 
Se, 39°5 38°39 
102°9 100°00 
__ This sam nd eRe also be formed by heatin copper ie 
nium, or by venting ouittdy the protoselenid in a close vesal (Be 
ip Ninian ballot Mail ga Livsd wish <cboteso-of land sed 
tox ard of iron, didnot take up any lead. 
