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of ethylene diamine have also been resolved by Werner. These 

 indeed were the compounds first examined by him, and conform 

 strictly to the theory, the cis compounds being all resolvable, 

 whilst the trans compounds are incapable of resolution. Among 

 the cis compounds which have been resolved, generally by 

 means of their camphor or d. bromo camphor sulphonates, 

 may be mentioned the 3.4. dinitro, the 3.4 dichloro, and the 

 3 chloro, 4 nitro ethylene diamine cobaltic salts, the 3 bromo and 

 3 chloro 4 amine diethylene diamine cobaltic salts, and the 

 3.4 dichloro diethylene diamine chromic salts of the formulae 



It may be noted that all attempts to resolve the trans 1-6 

 dinitro diethylene diamine cobaltic salt of the constitution 



Co /j~em 



HO, 



which, according to the theory, should be irresolvable, have 

 failed, although a splendidly crystalline camphor sulphonate 

 of the base can be obtained. 



