It is appareiil IVoiu lable 2 lliul llir soliiliility of the J.v./>, remains 

 iii\aii;ii)k' williiii tl]e cmtois of aiialvsis on increasing percentage of 

 Mil J 'I of llic solnlions. 'I'lic ,-oiiition (point /^) which conlains 7.087o 

 SHJ'I, contains 2.28" '„ J.s'./>, , wliile tiie aqueous saturated solution 

 (point (i) contains 2.267„ AsJJ^. Further it appears from tal)ie 2 

 tliat tiie solubility of the compound decreases on increasing percentage 

 of NHJJl of the solutions; in point li (N". 3 in taiile 2) the solution 

 contains still 2.28° „ .l.s-./>,, in liie solution, saturated with NH,Cl-{- D 

 fpoint '■ : K". it in talilc 2) the [)ercentago of As.J)^ is however 

 lowered to 0.2i:IJ7,i- ('onscqnrntiv the AsJ>^ is less soluble in a 

 solution, saturaleil with JS'HJ'l than in a saturated solution of /f67. 



Only the terminatingpoints r and <l of curve al, which represents 

 the solutions saturated with NHJJ, have been determined. 



In table 2 the results of the determinations are united; all the 

 small bottles have been shaken during 3 to 5 weeks in a thermostat. 

 Also here, although the AsJ)^ and the coin|tound are both an 

 e.\tremely line powder, the eye could oa.sily distinguish them by 

 their different behaviour on sinking. 



TABLE 2. 



Composition in percentages by weight at 30° 



The solubility of the NHJJ/ in pure water (N°. 10 of table 2) is 

 not deternuned, but taken from the tables of Lanoolt-Bornstein, the 



