112 



EEPORT — 1902. 



A layer two millimetres thick of a solution containing one milligram- 

 molecule in 100 c.c. transmits the spectrum to ^/k 2744 (\ = 3644), beyond 

 which point there is complete absorption to '/A 4321 (\ = 2314). 



The absorption band, which begins here, is very well marked and 

 persistent, being still traceable in a layer three millimetres thick of a 

 solution containing one milligram-molecule in 12,500 c.c. 



Quinone dichlorimide. — This substance was prepared from the hydro- 

 chloride of ;;-phenylene diamine by oxidation with bleaching powder. It 

 decomposed at 124^. Its absorption spectra in alcoholic solution were 

 photographed. 



Curves of Molecular Vibrations. — (8) Quinone Dichlorimide. 



A layer two millimetres thick of the solution containing one milligram- 

 molecule in 100 c.c. alcohol transmits all rays to "^ j\ 2768 (\ = 3612). 



The absorption band first makes its appearance in the layer three 

 millimetres thick of the solution containing one milligram molecule in 

 500 c.c, and can still be traced in the layer three millimetres thick of the 

 solution containing one milligram-molecule in 12,500 c.c. 



The amount of general absorption is very nearly the same as in the 

 case of quinone dioxime, but the absorption band does not make its 

 appearance so soon and is not so wide, although it is as persistent as the 

 band of the dioxime. 



