270 Dr. L. Silber stein on Fluorescent Vapours 



i. 



Series A. 



Series B. 



i 



Series C. 



n. 



8n. 



n. 



Sn. 



n. 



hi. 







1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18307 



18100 

 17890 

 17673 

 17468 

 17261 

 17049 

 16845 

 16636 

 16431 

 16231 

 16033 

 15837 

 15633 



{ 



15245 



{ 



14864 



207 

 210 

 217 

 205 

 207 

 212 

 204 

 209 

 205 

 200 

 198 

 196 

 204 

 194 

 194 

 191 

 191 



17328 



17118 

 16916 

 16705 

 16488 

 16283 

 16080 

 15879 

 15687 

 15476 

 15273 

 15091 



{ 



14681 



210 

 202 

 211 

 217 

 205 

 203 

 201 

 192 

 211 

 203 

 182 

 205 

 205 



17265 



17049 

 16842 

 16637 

 16641 

 16227 

 16022 

 15812 

 15616 

 15404 

 15199 

 15011 



{ 



14595 



216 

 207 

 205 

 206 

 204 

 205 

 210 

 196 

 212 

 205 

 188 

 208 

 208 





Mean, &"*= 202*53 



5w= 203-61 



^=205-38 



Thus, the required deviations from unity are small and 

 very nearly equal for the three series of iodine. 



Finally, let us remark that, p being greater than 0*98, we 

 could have theoretically, by what has been said in connexion 

 with formula (7), more than 90 lines, and since 8n is roughly 

 200, each of the series could extend even to the very end of 

 the spectrum (n = 0, or \ = oo). This would, obviously, be 

 the case also for smaller values of p. Thus, the condition 

 connected with (7) contains in reality no limitation, and a 

 non-Hookean resonator with the above p proves to be com- 

 petent to emit the observed resonance-series. 



