38 Dr. H. Pender on the Magnetic 



data for one complete set of observations, is appended. A 

 comparison of this table with Table III. of the previous paper 



Fier. 1. 



will show how greatly the conditions of the experiment have 

 been improved. In the latter the greatest deviation from 

 the mean of 2D is 42 per cent., while in the table below it is 

 only 4 '4 per cent. 



