56 Professor How on the Hyposulphites 



105 parts retaining but one of the salt. It is perfectly neutral 

 to test paper. In the analysis which follows, the salt was 

 dried by simple exposure over oil of vitriol under a bell jar, 

 as it decomposes in the water-bath, and only partially loses its 

 water of crystallization in vacuo, and is, moreover, so hygro- 

 scopic in this state, as to absorb moisture with great rapidity 

 when exposed to the air. The results it afforded were these : — 



4*757 grains, dried over HO SO ;i , gave 



9*870 ... carbonic acid, and 



2 810 ... water. 



4670 ... dried over HO SO a , gave 



2220 ... sulphate of baryta. 





Experiment. 

 . 56*58 





Calculation. 



Carbon, 



5667 



C 46 276 



Hyrogen, . 



. 658 



6*36 



H 31 31 



Nitrogen, 





5*74 



N 2 28 



Oxygen, . 





2466 



15 120 



Sulphur . 



.' 653 



6*57 



S 2 32 



100*00 100*00 487 



which accord in a perfect manner with the formula 

 C 46 H 26 N 2 8 ,HO,S 2 2 + 4HO. 



The crystals contain another atom of water, which they lose 



over oil of vitriol. 



J 9*765 grains, lost 

 1 0*175 ... water. 



equal to 1*79 per cent., and 1*81 is required to make up the 

 salt, 



C 46 H 26 N 2 O s ,HO S 2 2 + 5HO. 



When exposed to the temperature of 212°, the salt loses 

 one-tenth of its weight in the course of time, and a portion of 

 its sulphur evidently passes off in some form, for a specimen 

 which had been heated to this point for about three days 

 afforded less than 5 per cent, of sulphur on analysis. It was 

 also found to be no longer soluble in boiling water, a consider- 

 able amount of a brown resinous matter remaining undissolved. 

 The fluid contained some hyposulphurous and much sulphuric 

 acid. 



Hyposulphite of Papaverine. — I failed to obtain this salt 



