p. ZEEMAN. The red lithium line and the determination of atomic weights. 

 H. R. WOLTJER and P. ZEEMAN. Magnetic resolution and temperature. 



Fig. 1. Lithium doublet (6708). 



Fig. 2. Outer components of sodium lines of low 

 temperature in magnetic field 



Fig. 3. Magnetised sodium lines in gas-oxygenflame. 



Fig. 4. Magnetised sodium lines of 300° G. 



Proceedings Royal Acad. Amsterdam. Vol. XV. 



