I)R CHARLES G. BABKLA ON POLARISED RONTGEN RADIATION. 475 



TABLE I. 



TABLE II. 

 After Correction for Variation in Intensity of the Primary Radiation. 



movement of the gold-leaves was considerably increased. A consideration of the air, 

 the radiation from which entered electroscopes A, and A,, shows that the masses of air 

 were not identical. Again, much of the radiation entering these electroscopes made 

 a considerable angle with the plane perpendicular to the direction of propagation in 

 the primary beam. 



The results, however, indicate a partial polarisation of the same order of magnitude 

 as that obtained by experiments with paper or aluminium. Some of these are shown 

 in Table III. 



3 P 2 



