192 Prof. J. N. Lockyer. [June 13, 



Jnne 13, 1895. 

 The LORD KELVIN, D.C.L., LL.D., President, in the Chair. 



His Royal Highness the Duke of Saxe-Coburg-Grotha (elected 

 March 16, 1882) was admitted into the Society. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : 



I. " On the new Gas obtained from Uraninite. Fourth Note." 

 By J. NORMAN LOCKYER, C.B., F.R.S. Received May 28, 

 1895. 



Continued experiments on the gases obtained by heating the 

 minerals broggerite and euxenite in vacuo have revealed the presence 

 in the spectrum of an important line in the infra-red. By comparisons 

 with the solar spectrum in the firsb order grating spectrum, the wave- 

 length of the line has been approximately determined as 7065. There 

 can be little doubt, from the observations which have been made, 

 that this new line is coincident with a chromospheric line which 

 occurs in Young's list, having a frequency of 100, of which the 

 wave-length on Rowland's scale is stated to be 7065*5. 



It follows therefore that, besides the hydrogen lines, all three 

 chromospheric lines in Young's list which have a frequency of 100 

 have now been recorded in the spectra of the new gas or gases 

 Dbtained from minerals by the distillation method. 



These are as follows : 



7065-5 



5875-98 



4471-8 



The wave-lengths of the lines are in Rowland's scale, as given in 

 Schemer's " Astronomical Spectroscopy."* In a partial revision of 

 his chromospheric list, Professor Young gives the corona line 53] 6' 79 

 as also having a frequency of 100 in the chromosphere, but, up to the 

 present, this line has not been observed in the laboratory. 



* Frost's translation, p. J 84. 



