896 Intelligence ajid Miscellaneous Articles. 



raised, it loses its water without fusing ; it then evolves sulphurous 

 acid and part of its ammonia : the fused residue has an acid re-action. 

 It contains 18"44 per cent of water. 



Hyposulphate of barytes requires I'l part of water at 212°, and 

 4'04 parts at 65° for solution. It is insoluble in alcohol, its taste is 

 bitter and astrinsjent, unalterable in the air ; decrepitates strongly 

 when heated. M. Heeren remarks that this salt crystallizes in two 

 different forms, which cannot be reduced to the same primary form, 

 although the composition is evidently the same. It contains 10'78 

 per cent of water. By spontaneous evaporation it is obtained in ob- 

 lique quadrangular prisms, terminated by four facets. Exposed to the 

 air they effloresce and become opaque without losing their form : they 

 may be kept for a long time in moist vessels : they contain 19"48 per 

 cent of water, half of which they lose by efflorescence, and are con- 

 verted into the preceding salt. 



Hvposulphate of strontia is obtained in the same manner as the 

 barytic salt. It is soluble in 1-5 part of water at 212°, and 4*5 

 parts at 6U° insoluble in alcohol, unalterable in the air, and bitter. 

 It crystallizes in large hexagonal tables, the edges of which are be- 

 velled. It contains 22- 10 per cent of water. 



Hyposulphate of lime is obtained in the same way as the preceding, 

 the crystals of which it strongly resembles. It contains 26-24 per 

 cent of water, and requires 0-8 of water at 212°, and 2*46 at 67°, for 

 solution. Although insoluble in alcohol, it appears to yield part of 

 its water to it. Is taste is purely bitter. 



Hyposulphate of magnesia was obtained by decomposing the sul- 

 phate with hyposulphate of barytes. It crystallizes in hexhedral 

 prisms, which are unalterable in the air : these crystals fuse in their 

 water of crystallization at a high temperature. For solution they re- 

 quire 0'88 parts of water at 64°5 they contain 37' 69 per cent of water 

 of crystallization. 



Hyposulphate of alumina is procured by adding a solution of hy- 

 posulphate of barytes to one of sulphate of alumina. The solution 

 was concentrated by a gentle heat, and dried in a vacuum over sul- 

 phuric acid. The salt procured precipitated muriate of barytes j it 

 appears, therefore, that this salt cannot exist when deprived of water. 

 By spontaneous evaporation it is obtained in very small crystals. 



Protocarbonate of cerium was dissolved in hyposulphuric acid : by 

 spontaneous evaporation small colourless unalterable crystals of pro- 

 tohyposulphate were formed. 



Protohyposulphate of iron crystallizes in oblique quadrangular 

 prisms, which acquire oxygen gradually by exposure to the air ; but 

 they are neither deliquescent nor efflorescent : they are readily so- 

 luble in water, insoluble in alcohol, and have the taste and colour of 

 protosulphate of iron ; they contain 30-04 per cent of water. This 

 salt is obtained by adding protosulphate of iron to hyposulphate of 

 barytes ; and hyposulphate of zinc is similarly obtained : the crystals 

 are unalterable bv exjjosure to the air, very soluble in water, and 

 contain 32*24 per cent of it ; — their form could not be ascertained ; 

 their taste is astringent. 



Hydrosuiphuric 



