177 
*21385 grammes Na 2 S0 4 
were mixed with a very great excess of Na 3 S 2 0 3 and Na 2 S0 3 
and yielded after being treated as described above 
*2151 grammes Na 2 S0 4 
If sulphide is present this must be got rid of by means of 
cadmium carbonate before starting the analysis. 
A mixture was prepared containing per unit 
Na 2 S0 4 ... *4165 grammes = 39*06 
Na 2 So0 3 
*3946 
jj 
= 37-01 
Na 2 S0 3 
*2551 
= 23*93 
1*0662 
100*00 
and the following data got 
Total Na 2 S0 4 . 
1-4174 
grammes 
Actual Na 2 S0 4 . 
*4165 
therefore B = TO 00 9 
A = *833189 
from which we calculate 
Na 2 S0 4 
*4165 grammes 
= 38*98 
N a 2 S 2 0 3 
*3969 
= 37*15 
Na 2 S0 3 
•2550 
= 23-87 
1*0684 100*00 
I have used this method with great advantage in the 
analysis of intermediate as well as final products in the 
manufacture of soda ash and caustic soda. 
Laboratory of Gerards Bridge Chemical Works, 
St. Helens. 
“ Note on the Action of Iodine Trichloride upon Carbon 
Bisulphide,” by J. B. Hannay, F.R.S.E., F.C.S. 
It is stated by Weber that when iodine trichloride is 
added to carbon bisulphide a new product is formed. Now I 
have examined the action of these two substances upon each 
other, and find it is according to the following equation : — 
2CS a + 3IC1 S = CC1 4 + CSC1 2 + 3SC1 + 31. 
On adding carbon bisulphide to pure iodine trichloride till 
it was all decomposed, considerable heat was evolved, and on 
cooling, iodine crystallized out. A qualitative examination 
of the liquid showed the presence of sulphur chloride in large 
quantities, and on decomposing this with water, the charac- 
