( 354 ) 



Groups of four or five single proximate results simply were com- 

 bined by assigning to each mean abseissa the mean ordinate. 



The 2 X 7 principal values thus obtained are given in the first 

 three columns of the following table. 



All Ihese differences of wavelength are given in thousandths of 

 an Angstrom unit. 



The fourth column in like manner gives the amount of the 

 asymmetry. 



6. The last column contains the field intensity in Gauss. In cal- 

 culating it I have assumed proportionality between separation and 

 magnetic force. 



Increasing accuracy of the measurements has furnished continually 

 increasing arguments for this proportionality and the investigations of 

 Farber *), Weiss and Cotton 3 ), Paschen') and Stettenheimer 4 ) have 

 given a high degree of certainty to this simple law. 



The numbers in the fifth column are deduced from those in the 

 first by means of the separations of line 5770 -[-0.414 and — 0.415 

 given by Rdnge and Paschen for the field used in their investigation. 



The measurements of Runge and Paschen concerning the mercury 

 lines refer, as Prof. Paschen has kindly commmunicated to me, to 

 a field of 22750 Gauss according to measurements made in his 

 laboratory by Frl. Stettenheimer, and of 22780 Gauss according 



i) Fahuer. Diss. Tubingen, 1902; Ann. d. Phys. 9, 886, 1902. 



-) Weiss and Cotton. Journal de Physique. Juin 1907. 



'I Paschen. Pliysik. Zeitsehr. 8 Jahrgang N'. 16. 522, 1907. 



'i Stettenheimer. Diss. Tubingen, 1907; Ann. d. Phys. 24, 384 1907. 



