- on solutions of the Metals. 337 
an phosphids of copper previously described are Cu®P, CuP, and 
Phosphorus in solution of nitrate of silver throws down metallic silver, 
_ asobserved by Boeck. The silver has the usual color and metallic lustre, 
ind 1s apparently crystalline. No phosphid could be seen. 
Phosphor three days with a solution of acetate of Jead in a 
_ @losed test-tube, gave merely a few white flakes, probably of phosphate 
_ lead. On boiling, a black precipitate was rapidly formed in lar, 
a: along with white phosphate of lead. After dissolving out the 
fatter with caustic potash, the black substance was dissolved up in nitric 
acid, and tested for phosphoric acid. None was found: so that the sub- 
stance, it would seem, was metallic lead. 
_ 2. In the presence of reducing agents—Solution of sulphate of copper 
Was saturated with sulphurous acid, phosphorus added, the whole heated 
somewhat, and left three days in a closed flask. On opening the flask, 
he solution was colorless. ‘The result was metallic copper, and black 
id of copper, along with unchanged phosphorus. I did not at- 
tempt to analyze the phosphid, as it was so intimately mixed with finely 
divided metallic copper that it was impossible to obtain it pure. 
VI. Action of Arsenic on the solutions of Copper, Silver and Lead. 
‘1. Without the aid of reducing agents.—Pulverized metallic arsenic, 
1 with sulphate of copper, took up considerable copper. For analy- 
the product of this reaction, pure metallic arsenic, pretty finely 
i as boiled several hours with concentrated solution of sul- 
onium. This was washed with water, containing considerable am- 
Rag grms. gave 0-7211 arseniate of ammonia magnesia (2Mg0, 
NH“O, AsOS, +HO) and 0:9276 oxyd of copper. 
Calculated. Found. 
6Cu, 190°2 71-12 72°43 
75: 28:28 97-83 
; — 
: te 265°2 100-00 100-26 
arsenids of copper previously described are Cu4 As and Cu?As. 
— cin clatter of Baile of fiver: throws down metallic silver, as 
7: ig: waggle by Fischer Beg 
i ,* With the aid reducing agents.—Pulveri metallic arsenic, 
teated with olidaon of ats of copper and sulphurous acid, forms 
Au. Jove. S01.—sec on. XXXII, No. 99.—Mayr, 1862. 
q 
. = 
4 
