936 Dr. J. Ohadwiek and Mr. E. S. Bieler on the 



obtained for the angles between 2I°*4 and 31 0, 3 were 

 multiplied by the factor tan 2 31°-3/ (tan 2 31 '3-tan 2 21°'4). 



Fig. 6. 



The curves of fig. 4 lead one to expect that this would be 

 very closely true at the smaller ranges. From the values 

 of n so calculated, the values of p were obtained according 

 to the formula at the end of § 6. 



§ 8. Discussion, 



The results of the experiments described in this paper are 

 crystallized in the curves of figs. 5 and 6. From these we 

 should be able to deduce information about the field of force 

 around the a particle or helium nucleus, and also about its 

 structure. 



In the first place, our results are in strong contrast to 

 those to be expected if the nuclei behaved as point charges 

 repelling each other with forces varying as the inverse 

 square of the distance between them. Not only is the 

 angular distribution of the H particles different, but the 

 numbers projected at small angles are, for a particles of 

 high, velocity, many times greater than those for point 



