221' 



wave-lengths, as in oidinary cases. In (lie iieigliboiirhood of 5800 

 A. U, the absorption-spectrum, however, tioes not manifest a single 

 line or band. However the occui-rence of such an anomalous rotation- 





iri/'^c^rEcs ; 



3000 



2900 °l 



2800 



2700 



2600 



2500 



Z^OCT 



2300' 



2200". 



zooo 



ZIOO . 



Z200 



2300°. 



2400° 



2500° 



2£00° 



2700" 



2800° 



2900° 



3000 



f7> 



<i~JbtasaüJi^' 



w^' 



#^ 



^extroovrntarv \ 



58D0 



1 . 



jCaeAr>avmtorv 



yfcvvc-lemrtn, in. 



4590«30A87fl5flZDS1(155ie0SZ605M5ü0S515 5610 5700S8003910 60Zfl6l«fc260636Q6SZO 66606800 U/iastrüfriy - iCoCOS . 



dispersion under these circumstances seems to be theoretically expli- 

 cable, if the assumption may be made that at least two kinds of 

 active ions are present ^). 



Besides this anomalous rotation-dispersion, the whole character of 

 which is in sharp contrast to that of the regular one, the absolute 

 activity of these salts appears in general to be appreciably smaller 

 than that of the analogously constituted oxalates, unregarded the 

 passing through the zero-point in the case of the oxalate at 5970 

 A. U., formerly mentioned. The substitution of the oxalic acid-ions: 



COO' 



000' I 



I by the three ions of tiie malonic acid: CH, around the 



COO' ' I 



COO' 



1) Drude, Lehrbuch der Optik, (1900), p. 382. 



