6 
The simplest formula agreeing with the analytical numbers 
is Sb 3 0 4 Cl 7 , or three molecules of antimony pentachloride in 
which four atoms of oxygen replace eight of chlorine. 
Calculated. 
Found. 
Sb 3 
53-91 
.. 53-89 
Cl; 
36-62 
.. 36-58 
O. 
..... 9T4 .... 
100-00 
From the above results it is clear that the simple 
phosphorus oxychloride is not reproduced under similar 
circumstances in the antimony series, but that this element 
in agreement with its general deportment gives rise to more 
complicated compounds, 
The oxychlorides derived from antimony trioxide have 
been frequently examined; the results of the analyses of 
powder of algarotli made by different investigators varies 
considerably, and Sabanejeff has recently shown that these 
differences are probably due to the presence in the substance 
of antimony trichloride in varying quantities. This impu- 
rity he gets rid of by washing the oxychloride obtained by 
the action of a large excess of water on the trichloride with 
ether or carbon disulphide in which the trichloride dissolves. 
In this way he obtains a compound having the constant 
composition Sb 4 Cl a 0 5 , or two molecules of trioxide in which 
one of oxygen is replaced by two of chlorine, whilst a simpler 
monoxychloride SbOCl is prepared by acting with only from 
2 to 10 molecules of water on the trichloride. But this on 
treatment with ether or carbon disulphide loses trichloride 
and yields Sb.ChO,; thus 5 Sb0Cl=SbCl 3 +Sb 4 Cl a 0 5 - 
The results of my experiments lead me to the conclusion 
that the body obtained by the action of boiling water on 
the trichloride does not possess the composition Sb 4 CLO,;, 
but consists of 10 molecules of this substance and one of the 
