1901 - 2 .] Dr Hugh Marshall on Thallic Sulphates. 
311 
Looked at from this point of view it appears not unlikely that at 
some suitable temperature normal thallic sulphate might be most 
easily obtained from solutions containing a minimum of free sul- 
phuric acid, and experiments in this direction are being carried on. 
In the present paper I have omitted analytical results, etc., 
reserving details for the full report which I hope to communicate 
on completion of the investigation. 
{Issued separately August 30 , 1902 .) 
t. 
