226 



mother liquid, however, was now treated in an analogous way with 

 8 grams of sodium-iodide; the |)recipitate appeared to be this 

 time the laevogyrsiie trietliylenediamine-chroiin-iodlde. It is difficult to 

 obtain these iodides in well measurable ci-jstals, and they are moreover 

 ordinarily very small. 



^ 2. The rotation-dispersion of these salts was determined in the 

 usual way, already frequently indicated. As the orange coloured 

 liquids already manifested a very appreciable absorption of the trans- 

 mitted light in layers of 20 cm. thickness, the measurements for 

 the limiting wave-lengths had to be made with very dilute solutions. 

 These measurements agreed very well with those made in the case 

 of more concentrated solutions, so that for all solutions we have 

 eiven the mean values of the molecular rotations obtained. In the 



o 



case of the dextrogyratory component solutions were used, containing 

 1,0133 grams {A), 0,5070 grams (S), 0.2535 grams (C), and . 

 0,0325 grams {])) of the anhydrous salt respectively in 100 grams 



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