ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION, 



149 



COETDALINE. 



Cj,H,,NO,. M.P. 136°. 



Solution in Alcohol. 

 (Fig. 6.) 



Thickness of 



layer in 

 millimetres 



Description of Spectrum 



6, 4, and 3 



4 

 3 

 2 



1 milligram-molecule in 100 c.c. 

 Spectrum transmitted to 



Lines showing faintly at 



1 milligram-molecule in 500 c. 

 Spectrum transmitted to 

 Absorption band . 

 Weak spectrum from 3824 to 

 Spectrum transmitted to 

 Absorption band . 

 Weak spectrum 

 Same as 4 mm., but stronger, 

 Spectrum transmitted to 

 Absorption band . 

 Spectrum transmitted feebly from 3638 to 



1 nilUgram-violecule in 2,500 c.c 

 Spectrum continuous to . , . 

 Weak beyond. 



Still weak in position of absorption band. 

 Same as 5 mm., but somewhat stronger. 

 Spectrum continuous to 



»» 1) 



Weak beyond 

 Spectrum continuous to 

 Weak beyond 



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

 Spectrum practically al transmitted. I 



3387 2952 



3387 to 3638 2952 to 2748 



4107 2428 



4123 



2425 



Aktificiai Cobtdaliite and Inactive Coetdaline. 



The spectra of artificial corydaline and inactive corydaline are 

 identical with those of corydaline. 



