2 Art.S.— Y. Taktihashi : 



make exact measurements of such lines seems to be very difficult. 

 As for tlie single lines, lleese'' and Kent^^ found that the 

 separations of // 4680, 4722 and 4810 of zinc are not proportional 

 to the ^ekh hut Cotton and Weiss'^* showed that })ropo]-tionality 

 holds good for these lines. The deviations from the proportion- 

 ality given by Reese and Kent for other lines are much smaller 

 than those for the above lines. Several investigators showed 

 that magnetic separations of single lines are in general nearly 

 proportional to the field. 8o far. however, as the present 

 writer is aware, those lines for wiiich the separations are 

 accurately measured over a wide range of magnetic fields are very 

 few, so that it requires more extended experiments covering a 

 wide range of magnetic fields as well as numerous spectrum lines 

 to ascertain whether a linear relation between the sej^aration and 

 the magnetic field exists or not, wliicli seems to be very 

 interesting inasmuch as it may throw some light on the structure 

 of the atom. The following investigation was undertaken with 

 this object in view. For this purpose, elements rich in lines are 

 convenient, as the chance of coupling among the electrons may 

 be large in such an atom, for it is not probable that these lines 

 are emitted from separate atoms eacli l\y itself; indeed they give 

 man,y Zeeman triplets having divergent values of separations,"^ 

 which might be the result of coupling. 



Iron, manganese, calcium and titanium were examined, but 

 the experiments with the latter three elements being yet 

 incomplete, only tlie results obtained with the first are given in 

 the present report. 



Besides the fact that iron is rich in lines which give divergent 

 values oï magnetic separations, its ferromagnetic property — 

 though we do not know the property at the temperature of the 

 spark — may show some special character in its magnetic spectrum, 



1) Reese, Astrophys. Jour., 12 (1900) p. 120. 



2) Kent, Astrophys. Jour., 13 (1901) p. 289. 



3) Cotton et Weiss, Jour, de Phys., [4], 6 (1907) p. 429. 



4) Zeeman, Magnetooptics, (1913) p. 157. 



