270 
In all cases the mixture quietly deflagrated, without 
throwing any particles out of the platinum crucible. 
The following were the results obtained : — 
Percentage by 
True Percentage. 
Alkalimetry. 
1 
3G-9S 
o 
36*95 
O 
38 44 
38-80 
4 
39 64 
42-11 
5 
36-87 
41-70 
In the two first experiments the materials were kept fused 
at a low red heat for some time after deflagration had ceased. 
In the three last experiments the lamp was removed soon 
after deflagration had taken place. 
In the filtrate from the first experiment arseniate of soda 
was found. 
In the fourth and fifth experiments arsenic was also found, 
but not in quantities adequate to account for the difference 
between the two percentages. 
These wide differences between the results in the two 
columns no doubt depend upon the fact that the chlorate of 
potash does not act merely as an oxidizing agent, but gives 
up some chlorine. In all cases some oxygen compound of 
chlorine has been evolved with the carbonic acid. 
It is worthy of remark that many years ago it was stated 
by Vanquelin that the residue obtained after decomposing 
chlorate of potash was sensibly alkaline. (“ Ann. de Chimie 
ct de Physique,” xcv., 101.) A. few grammes of chlorate of 
potash were heated in a platinum dish for a few minutes, 
