8 AKT. 15,-TAMEMASA HAGA. 



Its solubility in water at 18° is one in 25.37 parts. It is neutral to 

 Phenolphthalein, litmus, methyl-orange, and other indicators. When 

 slowly heated to 100-120° in the air, it loses some of its water of 

 crystallisation and is then hydrolysed by the remainder, acting to- 

 gether with the moisture of the atmosphere, so that at first it loses 

 in weight and then grains. The residual mass is strongly acid owino- 

 to the presence of acid sulphate. It has not been found possible to 

 avoid hydrolysis, even when the salt is very gradually heated in a 

 current of dried air, after having already been exposed in a desiccator 

 at the ordinary temperature. Its water, therefore, could only be deter- 

 mined by difference. As expressed in the foregoing formula, which 

 agrees with Fremy's empirical formula, it is certainly 3/2 HX), 

 although Claus made it out to be 1/1 H 2 only. In his paper, five 

 concordant analyses of the anhydrous salt, besides four analyses of 

 the hydrated salt, are given ; and so far from reference being made 

 to any difficulty being experienced in rendering the salt anhydrous, 

 it is stated that the water of crystallisation easily escapes at 100°. 

 But it is important to note that his four determinations of the water 

 give numbers which are all somewhat higher than those required by 

 his calculation, although the salt occurs in large, clear, non-deliques- 

 cent crystals, and that the figures thus calculated are but little if 

 any higher than those obtained by the author in two direct deter- 

 minations of loss of water by heating, in which the residues were 

 always acid and therefore contained water. The salt has also been 

 analysed by Kaschig, but his results are not decisive one way or the 

 other (p. 30). 



Sodium Hydroxylaminetrisalphonate, (S0 3 Na)OX(S0 3 Na)o, 2H,0. — 

 This salt, now prepared for the first time, is obtained by boiling 

 a solution of 2/3-normal sodium hydroxylaminedisulphonate 

 and its equivalent half-molecule of sodium hydroxide with lead 



