8 Makowkr, Volatility of Radium A and Radiinn C. 



production from radium B, a [)latiiium rod was exposed 

 in the furnace described above {Fig. i) at 950° C, and an 

 electric field produced between the rod A and the iron 

 tube T by connecting the rod D and the tube T respectively 

 to the two terminals of a batter)' of 40 accumulators. The 

 experiment showed that whether the rod A was charged 

 positively or negatively with respect to the tube T, no 

 appreciable amount of active deposit was collected on the 

 rod A when subsequently tested in an electroscope. The 

 experiment failed, therefore, to reveal any charge on 

 radium C at the moment of its production, and it may be 

 inferred that this product, unlike radium A, acquires no 

 charge when it is formed from its predecessor in the radio- 

 active series. 



