112 



The results only of the readings will be given in the succeeding lists. 

 The tubes were now enclosed in pasteboard boxes to prevent effects 

 due to light and heat. Each box had a hole just large enough for the 

 insertion of the radium. 



It was observed that with a given adjustment the drift of the needle 

 was often tolerably constant, and. for a considerable period in the same 

 direction. Sufficient additional resistance was now introduced at K. to 

 cause the needle to drift in the opposite direction so that the influence 

 of the radium would be exerted against the drift. 



A solution of AgN0 3 was next used as the electrolyte. The Ag and 

 Cu made a battery to such a degree that no consistent results could be 

 obtained. A considerable amount of Ag was deposited on the Cu elec- 

 trodes. Evidently a very dilute solution would be more likely to give 

 results. The most satisfactory solution used was made by diluting 3 CC 

 of the Cu S0 4 solution used at tirst to 100 cc. 



In Table V the radium was placed alternately upon N and S and 

 readings taken eyeiw two minutes. 



