302 



No distinct eleavability was observed. 



Notwithstanding the striking analogy in form, a distinct and real 

 difference in the angular values and parameters is found to exist; 

 the ratio a : h is analogous to that of the ;m?25-compound, while 

 for b : c exactly the same is true with respect to the cw-derivative. 

 It is difficult to make sure whether here a double-compound of 

 the isomeric salts is present, or a mixed-crjstal between them. The 

 fact that the angular values are somewhat fluctuating, and that the faces 

 often reflect irregularly, might be looked upon as an argument of 

 the greater probability of the last mentioned supposition. In any 

 case, the peculiar crystallonomical analogy, and the intermediate 

 shape of these crystals between those of the components, are highly 

 remarkable phenomena, perhaps explicable by the only feeble mor- 

 photropic influence of TVO^-groups in general. 



It is worth drawing attention, moreover, to the fact that all the 

 cis-Biethykiiedianwie-óenvaüves here studied, have monodinic sym- 

 metry, however not that of the group 6V Probably there will be 

 salts of this particular symmetry amongst the optically-active com- 

 ponents of these racemic salts. 



§ 12. Finally we give here a description of racemic Tri- 

 ETHYLENEDiAMiNE-ziNC-CHLORiDE, the fission of whicli is also attempted 

 in this laboratory. 



\Zn (EineW Cl, + 2H,0. 



cu. 



a' 



a 



111 



Fig. 10. 

 Tri-ethylenediamine-Zinc-Chloride. 



