54 



reverse case to l)c present here, wliere a liülohedrical molecular 

 structure will tluis be built ii|) by üptically active molecules. 



///. In conucclion with the foregoing description of the dextro- 

 gyratory antipode, the crystal forms of the corresponding hromo- 

 aud chloi'otartrati'ü, from which the active compound could be 

 prepared, may here be described in detail also. 



Tiie d(l'-hUeo-triethylenedi(i)iüne-cobalticldorotavtrate, as well as 

 the corresponding (Id'-luteo-triethylenedlnmlne-cohnltihromotartrate, 

 crystallise from the solutions of the raceniic chloride, resp. bromide, 

 after being mi.xed with silver-f/-tartrate-solutious, in the siiape of 

 hard, very beautiful, trauslucid and commonly big crystals. If elimi- 

 nated from the original solution, this last will solidify, after having 

 been again concentrated and some more of the above-mentioned 

 crystals having been separated, into a brownish-red jelly, which for 

 the greater part represents the dl' -hromotartrate, and which after 

 treatment with HBr, will give the laevogyratory antipode, besides 

 some of the racemic compound. After a considerable time the jelly 

 of the (//'-bromotartrate often gradually transforms into a crypto- 

 crystalline mass. 



n. dd'-Luteo-Triethi//enediai)iini'-Cofjahich/orotartrate. 

 Formula; \Co {Ai^in),] ./-. /i ir . 



Big lustrous, brownish-yellow crystals (fig. 3), which commonly 

 have the aspect of oblique parallelopipeda. 



I'riclmic-pedial. 

 a:h:c = 0.6211 : 1 : 0.6521 



a = 102° 20' 

 ii=101°16' 

 r= 95° 167,' 

 a = llOOj and a' = jlOOj, 

 large and lustrous ; h = \0W\, b' = jOTOj, c = jOOl j 

 and c' = jOOlj, equally large and well reflect- 

 ing ; r^=\lO[\, well developed; (y=:j011|. about 

 as large as /•; in = \230\, only very narrow, and 

 often totally absent. The angular values oscillate, 

 as in the case of the bromotartrate, not unappre- 



.1 = 103° 42', 

 B = 102° 46' 

 C= 98° 17/ 

 Observed Fonns : 



Fig. 3. 



Clobaltichlorotartrate. 



i-ial»ly : tleviations of 0°30' to 1° are not seldom ild'-Tiielhylenediamine- 

 found with different individuals. A distinct 

 cleavage was not found. 



