26 



49.26 



337 



IL Di3C2H3 02 + 4H2O. It crystallises at a temperature of about 

 15" in large, well formed tabular crystals which lose at 110" 3H2O 

 (found 13.84, calc 13.8l). 



1.250 gram gave 0.0533 gram DijOg. 

 In percent: 



Calc 



Di203 42.64 166 42.46 



C4He03 - 153 — 



H2O — 72 — 



391 



Spec. Grav. of the anhydrous salt. 



0,9095 gram, t" 16''.5, sp. Gr. 2.190 

 0.8750 » » 13°.5 » y> 2,125 



Molecular volume: 150.1. 



Spec, Grav, of the monohydrated salt, 



1,0219 gram, t" 20°, sp, Gr, 2.230 

 0.7688 » » » » » 2.244 



Mean of both determinations: 2.237. 

 Molecular volume: 150.6. 



Spec. Grav. of the tetrahydrated salt. 



0,6909 gram, t" 13''.5, sp, Gr. 1.884 

 1.0874 » » » » » 1.881 



Mean of both determinations: 1.882. 

 Molecular volume 207.8. 



The anhydrous salt, used for the determinations, was perfectly 

 soluble in water and gave on spontaneous evaporation crystals of the 

 salt II. It is very remarkable that the specific gravit}^ of the anhydrous 

 salt was found lower than that of the monohydrated salt. 



