404 Scientific Intelligence. 
on saturating with potash only 12°9 calories are evolved in place 
Hence the bisulphite undergoes this change to metasul- 
io) 
~ 
or 
« 
the solution, gives 12°6 as before. Even if the solution of meta- 
sulphite be heated to boiling and preserved three days, it still 
evolves 12°5 calories on being saturated with potash. Solutions 
of bisulphite on the wcaen ty recently prepared, give 15°2 calories 
The anhydrous bisulphate S,O,K, is transformed into normal 
: 
bisulp ate i ence of water, with evolution of heat (1°45 
without losing any sulphurous oxide. This view is confirmed by ° 
the heat of solution, which is the same for the anhydrous and the 
ydrated metasulphite. Under the action of heat, the dry metasul- 
phite does not change at 150°; but toward a dull red heat it 
5 
evolves sulphurous oxide thongh without producing any neutral 
sulphite; the reaction being (S,O,K,),=(SO,K,),+SO,+5. Hence 
the metasulphite has relations to the normal pisul phite resembling 
those which distinguish the ethylsulphites properly so called (C, 
-K,O.8,0, produced b ntpositi 
tad 
= 
@ 
2 } co 0 
ether by alkalies, from the ethylsulphites (C,H,),8,0,,K,0 (other- 
wise called hydreth ylsulphates) obtaine xidation of ethyl 
Ratio S: K. Sulphide K,S,+53; hyposulphite 8,0, 3: 
metasulphite S, sth, + 184°6 ; hyposulphate S,0,K,+205°77 . bisul- 
phate (metasulphate) S,0,K,,+236°6; persulphate 5. OK, : ad 
2 
