HYDROXYAMIDOSULPHATES BY COPPEPw SULPHATE. 503 



Sulphur as dioxide ; as trioxide and amidosiilphate ; as acidity. 



Found 16.3 83.3 9.3 



Calc 16.6 83.4 12.5 



A solution of potassium hydroximidosulphate heated with 

 very little more than its equivalent of copper sulphate, gave 

 results showing that 25 per cent, of the salt yielded all the 

 sulphur of the hydroxyamidosulphate coming from it by hydro- 

 lysis, as sulphur dioxide : 



Sulphur as dioxide ; as trioxide ; as amidosulphate ; as acidity. 



Found 2.5.2 37.3 37.0 5.5 



Calc 25.0 37.5 37.5 6.25 



A solution containing sodium hydroximidosulphate and 

 copper sulphate decomposed in two experimenis, in such a way 

 that about 28 per cent, of the hydroxyamidosulphate sulphur 

 became dioxide : 



Sulphur as dioxide ; as trioxide ; as amidosulphate ; as acidity 



Found 27.6 36.9 35.0 4 



, 28.0 36.2 3.5.8 5.8 



Calc 28.0 36.0 36.0 4 



The numbers in the above table stand for parts per hundred 

 of the sulphur of the total hydroxyamidosulphate decomposed, 

 and not of the sulphur of the hydroximidosulphate even when such 

 a salt has been that experimented with. The ' acidity ' sulphur 

 is calculated as if the acidity is due to sulphuric acid, not 

 amidosulphuric acid. The * trioxide ' sulphur is that of the 

 sulphuric acid and copper sulphate yielded by the decomposition. 

 The differences between the calculated quantities and those 

 found must be largely attributed to imperfect estimation ; they 

 cannot be due to error in theory^, because no other explanation 

 of the change than that adopted is possible. In a copper-salt 



