ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 



147 



Htdrastine. 

 C.iH^iNO,. M.P. 133°. 



Solution in Alcofwl, 

 (Fig. 4.) 



Thickness of 



layer in 

 millimetres 



Description of Spectrum 



\ 



5, 4, and 3 

 2 



5 

 4 

 3 



4 



2 and 1 



1 viilligram-vwlecule in 100 c.c. 



Spectrum transmitted to . . . 

 J* >» • • , 



1 milligram-molecule in 500 c.e. 



Spectrum transmitted to . . . 

 Ahiorption hand ..... 

 Lines faintly transmitted at 

 Spectrum transmitted to , . . 



Absorption hand 



Spectrum feebly transmitted from 3638 to 

 Spectrum transmitted to . . . 

 Ahiorption band . . . . 

 Spectrum transmitted from 3638 to 

 Spectrum transmitted to . . . 



Absorption band 



Spectrum transmitted from . 



1 milligram-molecule in 2,500 c.c. 



Spectrum transmitted to . , . 



Absorption band 



Lines showing faintly in absorption 



band about 



Spectrum transmitted from 3530 to 

 Spectrum transmitted to . . . 

 Still weak in position of absorption 



band. 

 Same as 4 mm., but faintly transmitted 



at 



Spectrum transmitted to . . . 

 Weak beyond 



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



Spectrum transmitted to . . . 

 Line showing faintly at , . . 

 Same as 5 mm., with additional line at 

 Spectrum all transmitted. 



L 2 



