ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 



151 



Dehtdrocortdaline Nitrate. 

 C,,,H,3NO,HN03 + 2H,0. 



Aqtteous Solution. 

 (Fig. 8.) 



Tliickness of 



layer in 

 millimetres 



Description of Spectrum 



1 

 \ 



5,4.3 

 2 



5 and 4 

 3 



5 

 4 



3 



2 



1 milligram-molecule in 100 c.c. 



Spectrum practically all absorbed. 

 Spectrum feebly transmitted to . 



2162 



2789 



1 milligram-molecule in 500 c.c. 



Spectrum transmitted to . . . 



»» i» • • . 



\st Absorption hand .... 



Spectrum very feebly transmitted from 



2714 to 



Spectrum transmitted to . . . 

 \st A hsorption hand .... 

 Spectrum transmitted from 2673 to 



1 milliffram-molecvle in 2,500 c.c. 



Spectrum continuous to . . . ^ 

 Still weak in position of absorption 



band. 



Spectrum continuous to . . . 2789 



2nd Ahsorj}tion band .... 2789 to 3282 

 Spectrum very feebly transmitted from 



3282 to 3309 



Spectrum continuous to . . . 2884 



2nd Absorption hand .... 2884to3282 



Spectrum very feebly transmitted from 3282 to 3341 



Spectrum transmitted to . . . 2884 



2nd Absorption hand .... 2884 to 3148 



Lines showing faintly in the band of i 2982, 3042, 



absorption at . . . . t and 3064 

 Spectrum feebly transmitted from 



3148 to 3471 



2202 



2244 



2244 to 2714 



2768 

 2277 

 2277 to 2673 1 4391 to 3741 



2768 3612 



4625 



4541 



4456 



445610 3684 



3612 

 4391 



3585 



3585 

 3585 to 3047 1 



3022 



3467 

 3467 to 3047 

 3047 to 2993' 



3467 1 

 3467 to 3177 

 3353, 3287, 

 and 3264 



2881 



4 tol 



1 milligram-molecule in 12,500 c.c. 



Spectrum practically continuous to 



Weak beyond 



Still weak in position of absorption 



band. 

 Spectrum practically all transmitted, 



gradually getting stronger. 



4405 

 3471 



2270 

 2881 



