EXPLANATION OF PLATE. 



Figure 1. 



Positive of Ti \ 3913.58 as apparent on plate No. 22. 

 Mean shift as given by plates 22 to 25, 0.031 t.-m. 



Figure 2. 



Positive of Ti A 3913.58 as apparent on plate No. 27. 



Influence of self-induction shown. 



Mean shift as given by plates 26 and 27, 0.005 t.-m. 



Figure 3. 



Positive of Zn \ 4722.20 as apparent on plate No. 47. 

 Mean shift as given by plates 47, 48, and 43, 0.065 t.-m. 



