I9S 



NATURE 



\yan. 2, 1879 



began in the early part of the present year, and which has 

 taken six months, summarised all the observations of 

 metallic spectra compared with the Fraunhofer lines 



accumulated during the whole period of observation. 

 Now this reduction has shown me that the hypothesis 

 that identical lines in different spectra are due to im- 



table I.— final reduction-iron. 



