«98 





<i{00 '400 5000 S200 



//(tu,a/{i/ . ^l('//////'// -/hy.'t'/yu// 



5600 5800 bOOO 6Z00 &M)0 6600 ('/////.>•// ■<•/// -(/////.' 



Ficj.T 



deviating- position amongst tliem. ') However, tins salt shows a complete 

 analogy in this respect with the corresponding (:7i/'0////V<//i-salt, as may 

 be easily seen from the measnrements made in this laboratory by 

 Mr. F. J. Bb:cKKK with the jxHassin in-cki'inin-o.valate : K, \Cr(C\0^)f\ 

 -\-3H^(), wiiich was separated into its antipodes after Wehneh's 

 method"). 0)i comparing the rotation of this salt with that of the 

 cohalti-sah at corresponding wave-lengtlis, it may be seen that the 

 rotations of the chronnuin-SiRH are, u\) to 5640 A.U., and above 



') According to an inves;tigalion of G. Bruhat (Bull, de la Soc. Chiin. (4), 17, 

 226 (1915), there is also a maximum in the dispersion-cuive of the complex 

 irklii(m-o\d\A[e at short wave-lengths (about 4930 A.U.). It therefore seems probable, 

 that the character of the anomalous dispersion curves is really very analogous in all 

 these cases, however widi a considerable difference in the positions of the'maxima. 



») A. Werner, Ber. d. d. Cheni. Ges. 45.- 3061 (1912). it is difïïcult to obtain 

 good crystals of this compounil uliich, moreover, rapidly autoracemises in solution; 

 iherefore crystallograpliic measurements could till now not be made in any way. 



