Alkaline nitrites wpon Orie acid. 221 
chlorid with potassic stryphnate and repeated recrystallization. 
Of the pale yellow needles 
0°5553 gr. gave 0°5179 gr. carbonic acid and 01171 gr. water = 
25°43 per cent carbon and 2°34 per cent hydrogen. 
0°3157 gr. gave 0°0454 gr. lime = 10-27 per cent calcium. 
Calculated. Found. 
Carbon 8 25°26 25°43 
Hydrogen 8 2°10 2°34 
Calcium 1 10°52 10°27 
The salt was dried at 102° C. Its formula is therefore 
€a(€,H,N, 8.) + 2H,90 
Magnesic stryphnate was prepared by precipitating magnesic 
sulphate with potassic stryphnate and recrystallizing. It 
orms very beautiful small yellow prismatic crystals. The salt 
was dried in pleno over sulphuric acid for analysis. 
0°8429 or. gave 0:2876 gr. water and 0°6833 gr. carbonic acid= 
22°10 per cent carbon and 3°79 per cent hydrogen. i 
0°5080 gr. gave 0-0467 gr. magnesia = 5°51 per cent magnesium. 
Calcula Found. 
Carbon 8 22°02 22°10 
Hydrogen 16 3°69 3°79 
Magnesium 1 5°50 5°51 
The formula of the salt is therefore Mg(©,H,N,@,), +6H, 9. 
It is, of all the stryphnates examined, that which crystallizes 
most perfectly. 
Plumbic stryphnate Pb(€,H,N,@,),+3H, 9, is precipita- 
ted from plumbic acetate as a very pale yellow granular crys- 
talline powder which is almost perfectly insoluble in water. It 
becomes basic by treatment with boiling water or even by long 
washing with cold water. 
1°3839 gr. gave 0-2332 gr. water and 0°8228 gr. carbonic acid = 
16°21 per cent carbon and 1°87 per cent hydrogen. 
0°6014 pr, gave 0°2298 er. plumbic oxyd = 35°46 per cent of lead. 
alculated. Found. 
Carbon 8 16°52 16°21 
Hydrogen 10 1°72 AST 
Lead 1 35°50 35°46 
A portion of the lead salt by long washing with boiling water 
became bright yellow, and on analysis 
0°6895 gr. gave 0-0960 gr. water and 0°3219 gr. carbonic acid = 
12°74 per cent carbon and 1°53 per cent hydrogen. 
10874 gr. gave 0°6139 gr. plumbic oxyd = 52°39 per cent lead. 
These results correspond tolerably well to the formula 
| Pb(€,H,N @,), + PbO + 3H,6 which requires carbon 12°48 
’ hydrogen 1-27, and lead 52°54 per cent. 
