ON OUR KNOWLEDGE OF SrECXRDJI ANALYSIS. 



Table VIII. 



135 



In a preliminaiy examination,^ Professor Kundt had come to the 

 conclusion that solvents displaced absorption bands towards the red in 

 the oi'der of their dispersive powers. A look at Table VIII. will show 

 that no absolute rule, however, can be given, for the order of the solvents 



Table IX. 



is difiTerent for different colouring matters. At the same time it is cer- 

 tainly remarkable that the liquids of high dispersive powers always 

 stand at the bottom of the list, while those of low dispersive powers 

 stand high up. Professor Kundt therefore now replaces his old conclusion 

 by the less definite rule that ' When a colourless solvent has a considerably 

 larger dispersive power than another the absorption band of a colouring 



' Poggendorff, Juhelbaiid. 



