280 



SCIENCE PROGRESS. 



More recently Professor Ramsay has abandoned his 

 view of the simple nature of the cleveite gas, and states 

 that from his experiments "there appears ground for the 

 supposition that helium is a mixture ". 1 



THE EXISTENCE OF THE NEW GASES IN CELESTIAL BODIES. 



And now comes the great revelation, and it is this. 

 The majority of the lines classed as unknown in the spectra 

 of the Orion nebula, stars of Group III. and the sun are 

 really due to the cleveite gases. 



The following table sets this result out. It will be seen 

 that of seventeen unknown lines, twelve have been run to 

 earth. 



COMPARISON OF UNKNOWN {PREVIOUS TO HE. AND X) 

 LINES IN ORION NEBULA AND BELLA TRIX. 



* Between these AA there are forty-two lines in the Orion photograph of which six are 

 known other than He. and X. 



t Between these AA there are forty-five lines in the Bellatrix photograph of which 

 five are known other than He. and X. 



The following tables give the complete list of lines 

 and the celestial body in which they have been traced. 



1 Nature, vol. liii., p. 598. 



