124 
CONTRIBUTIONS TO CHEMISTRY AND MINERALOGY. Trull. 167. 
or under pure water. On drying at 100° it became grayish olive 
colored, apparently because of the separation of some silver oxide. It 
gave the figures under 1, 2, and 3. 
If a solution of a neuteal tetrametaphosphimate be added to ammo- 
niacal silver nitrate containing the least possible excess of ammonia, a 
nearly white flocculent precipitate forms in small amount, which is 
soluble in ammonium nitrate solution on gently warming; from this 
solution an orange-yellow semicrystalline body is thrown out on boiling 
for a moment. The latter is obtained in greater abundance by boiling 
the original filtrate from the silver-nitrate precipitate. It seems to be 
merely the crystalline modification of the above amorphous yellow salt. 
It gave the figures under analysis 4.% The nearly white modification 
is obtained in greater amount by using a solution of silver oxide in 
ammonium nitrate solution. It shows a considerable deficiency of 
silver (P : Ag = 4 : 6.7) and seems to be less stable than the correspond- 
ing white hexa-silver trimetaphosphimate, as it can not be obtained 
entirely free from the yellow modification. The yellow form also shows 
a slight deficiency of silver, and unlike the trimetaphosphimate, it can 
not be converted into a red form. 
The yellow salts, dried at 100°, gave : 
Calculated for 
P 4 N 4 8 Ag 8 . 
Found. 
1. 
2. 
3. 
4. 
p 
10. 59 
73. 69 
10.47 
71.86 
10.88 
71.60 
10.80 
71. 96 
10.89 
72.21 
Ag; 
1. P : Ag=4 : 7.90.^ 
2. P : Ag = 4 : 7.57. - Amorphous. 
3. P : Ag = 4 :7.66.) 
4. P:Ag = 4:7.63. Semicrystallme. 
4. THE HIGHER CHLORONITRIDES. 
In the first section of this paper I have shown that in addition to 
the phosphonitrilic chloride, 1 P 3 N 3 C1 6 , discovered by Liebig, there exists 
another, P 4 N 4 C1 8 , of similar properties, which is formed at the same 
time, but in smaller quantity. The opinion was expressed that these 
bodies belong to a series of polymers, (PNC1 2 ) U , the existence of other 
members of which was indicated by the formation, in small amount, of 
a liquid of the same empirical composition. The yield of this second- 
ary product, only 2 per cent of the theoretical or 1 per cent of the 
pentachloride used, was too small to allow of its preparation in quanti- 
'I propose in future to use the term phosphorus chloronitride to denote any hody composed of phos- 
phorus, nitrogen, and chlorine, the name phosphonitrilic chloride heing reserved for chloronitrides 
helonging to the series (P-NCl 2 )n. 
