( 299 ) 
red. In strong fields I noticed a few. I could show however that 
most of these asymmetrical triplets were due to superpositions and 
I concluded that we had no evidence of a directing influence of the 
magnetic field on the orbits of the light-ions. No more was done 
upon this subject. 
2. Some time ago Prof. Vorer of Göttingen kindly communicated 
to me that he had deduced from theory that normal triplets must 
show in weak magnetic fields a remarkable asymmetry viz. the outer 
component toward the red has the greater intensity, the outer com- 
ponent toward the violet has the greater distance from the original 
line. In low fields these asymmetries will preponderate, disappearing 
however in strong fields !). 
It has given me much pleasure to undertake at Prof. Vorar’s 
request a testing of this result of his theory. 
I made these observations the more willingly now I was in 
possession of a beautiful concave grating, which Prof. RowLanpb 
with kind courtesy has examined and selected for me. The grating 
is, like the one lent from the Leyden laboratory, ruled with 14438 
lines to the inch and has a radius of about 3 M. The resolving 
power of the present grating is however superior to that of the one 
formerly used. Negatives now were taken generally in the second 
order. 
3. I tried to study by eye observation, using the spectrum of 
the first order, the inequality of the outer components. Iron termi- 
nals (all following facts relate to this substance) were used. A 
Nicor’s prism was placed before the slit with its plane of vibration 
vertical, in order that the outer components of the triplet only 
were visible. 
But notwithstanding the lateral components were but slightly 
separated and therefore the circumstances, and as to intensity of the 
field and as to facility of comparison, very favourable, I could not 
conclude to an indubitable inequality of the outer components. It 
may be that the flickering of the spark interferes rather infavour- 
able with these observations. 
4. I had more success with the photographs taken. I studied 
the spectrum of the second and third orders; between 3400 and 
1) Vorer’s paper will be published shortly in Wiedemann Ann. under title ; “Dis- 
symmetrie der ZEEMAN’schen Triplets”. 
