198 



Weismann, 170. 



Wilson, temperature of sun, 174. 



Wolf, Dr., spectra of nebulre, 121. 



Y. 



Young-, eclipse 1870, 41. 

 Yttria, fractionation of, 



molecule of, 118. 



" old," 117. 



spectrum of, 118. 



INDEX. 



Z. 



Zeeman, effect, Ames, 112. 

 Earhart, 112. 

 Larmor, 110. 

 Lorentz, 110. 

 on iron, 112. 

 Preston, 113, 114. 

 Reese, 112. 



magnetic perturbations of lines, 

 110, 188. 



HARBISON AND SONS, Printers in Ordinary to Her Majesty, St. Martin's Lane. 



