

xxvi.] MORE WORK WANTED. 



to have weight. For my own part, I cannot fail to see here a 

 region where much work is required, and in which, perhaps, 

 some deep secret lies hidden. Much work has been done 

 already by myself, which I have not yet published, though I 

 have referred to it on p. 232. A glance at the facts stated there 

 with regard to iron and titanium will show that doubling the 

 lines is not enough to explain the three- and four-fold co- 

 incidences there recorded as the result of four years' work on 

 spectrum purification. 



Finally, I remark that the question of dissociation itself is 

 not really so much affected by the basic-line evidence as the 

 other question whether the dissociation has reached a certain 

 term, defined by the presence of common constituents. 



The varying intensities of lines, on the other hand, deals 

 with the question of dissociation only, pur et simple. 



