Morrow — On the Influence of Self- Induction., Sfc. 613 



Bromine. 



When there was much bromine vapour present, it was extremely difficult 

 to make the current pass between the electrodes ; it flashed across between 

 the capillary tubes and the sides of the flask. 



A number of bromine lines were obtained in the spectrum, several 

 showing in the ultra-violet region which had not been measured before. 

 There was an absorption of the rays between X 5700 and A 3740. This 

 absorption is nearer the visible region than that obtained with chlorine. 



Self-induction sharpens the principal lines, but has also the effect of 

 causing many others to become discontinuous. When carbon was sparked 

 in the vapour, there must have been some liquid condensed on the side 

 of the flask, as only a very small part of the spectrum shows in the 

 photograph. 



Principal Lines of Bromine. 



Iodine. 



The spectrum of iodine shows twenty-six lines in the ultra-violet region. 

 These have not been observed before, as the previous measurements extend 



