214 



j( : t|j : (O = 6,8980 : 6,4274 : 6,6306, for the raceinic rhodium-sah, 

 and / : a> = 7,2660 : 6,4944", for tlie optically-active salts, with respect 

 to hexagonal axes, and / = ^P = to = 6,1856, with respect to rhom- 

 bohedral axes. 



Comparison with the corresponding parameters of the here studied 

 iridiwn-sa.hs ') : 



teaches us, that the substitution of the central /^Ao-atom in the 

 complex oxalate by the isomorphons /?'-atom, produces adiminulion 

 of the topical pai-ameler to in the case of the racemic salts, but a 

 slight increase, in the case of the optically active antipodes, although 

 the values for x and x' are in this case smaller with the correspond- 

 ing Rho-SRlt. 



In the same way as in the case of the previously described 

 rhodium-oxdlate, all phenomena observed in the tission oi potassium- 

 iridium-oxalaie are really in full agreement with the sense of 

 Pasteur's law. 



Laboratori/ for [norganic and Physical 

 Ckendstrij of the University. 



Groningen, June 1918. 



') The specific gravity oi racemic K^\Ir (C^Oi)?,]^- i'^ I ^ H.O was at 18° G. 

 determined at: di'' = 2,688; the molecular volume is thus: 243,8!2. 



