ON ABSORPTION SPECTRA AND f'HEMlCAL CONSTITUTION. 



165 



BULBOCAPNIN — oontimied. 



Thickness of 



layer in 

 millimetres 



Description of Spectrum 



1 iHllliffram-moleculii in 2,500 c.o 



Spectrum continuous to 



Ahsurptiooi hand .... 



Very weak spectrum from 388U to 



Spectrum continuous to 



Abnorjitwn hand .... 



Spectrum from 3886 to . 



Lines in absorption band feebly shown ( 



at I 



Spectrum continuous to , , . 

 Absorj/tion band ..... 

 Weak spectrum from 3824 to 

 Spectrum practically continuous to 

 Weak in position of absorption band. 

 Spectrum practically transmitted to 



I 3521 I 



3521 to 3886 



I 4038 



3521 



3531 to 3886 



4128 

 3508, :!638, 

 , and 3824 



3C38 

 3638 to 3824 



4128 

 i 3824 



4050 



2840 

 2840 to 2573 



2476 



2840 

 2840to2573 



2422 



2802, 2748, 



and 2615 



2748 

 2748 to 2615 



2422 



2015 



2147 



1 milUgram-molccuh in 12,500 cr. 

 Spectrum all transmitted. | 



Nabceine.^ 

 0,3 Ho,XO, + 3llfi. M.P. 1 4.0° 



Solution in Alcohol, 

 (Fig. 22.) 



I Hartley, Phil. Trans., 1885, Part JI., p. 4'fl, 



