Chemistry and Physics. 115 
and the vapor of sulphur. Sulphid of nitrogen has little or no odor, but 
it strongly irritates the mucus membranes when brought into contact 
with them. In water it is insoluble; alcohol, ether and turpentine dis- 
solve small portions of it; bisulphid of carbon is its best solvent. The 
composition of the sulphid of nitrogen was found to be expressed by 
the formula NS2. Boiling water decomposes the bisulphid of nitro- 
gen; the reaction is expressed by the equation 
4NS2+-15HO— S202, NH40+2(S20s, NH:0)-+NHs. 
Caustic potash in like manner produces decomposition; the final pro- 
ducts of the action are expressed by the equation 
_ 2NS2+38K0+6HO=S202, KO+2SO2K0+2NHs. 
The bisulphid of nitrogen unites directly with the two chlorids of sulphur 
and forms with each several distinct compounds. The authors rey to 
described a new base containing cobalt and the elements of ammonia. 
Ammonia is to be added in excess to a solution of proto-chlorid of 
Cobalt mixed with four times its weight of chlorid of ammonium. The 
Solution rapidly absorbs oxygen from the air, and if placed in a bottle so 
ut i$ deposited in the form of small sparkling ruby-red octahedrons. 
d water 
v salt is sparingly soluble in cold water, more soluble but 
ct, bisulphid. ‘The analyses of the new salt led to the formula 
‘ioe NsH16, so that its formation may be represented by the equa- 
EN H4Cl+4NHs=Co2ClsNsHi6. These elements may 
ee be grouped in various ways; perhaps:the most probable is 
we following : CIN ‘ Cox 2CIN | Me,» admitting with Graham that 
oe may replace hydrogen. With chlorid of platinum the salt 
an a buff-colored silky precipitate, Co2ClaNsH16-+2P! Clz. With 
Sire of mercury it gives a bulky silky precipitate of red needles 
the wchted by Co2ClsNsH1c-+6HgCl. Oxyd of silver throws down 
on chlorine from the salt and yields a highly alkaline liquid, wa c 
. Sanding a few hours is decomposed; the solution contains the 
4 of the new base Coz0sNsHis. The 
