Gases hy the Alpha Particles from Polonium. o 73 

 Fig. l. 



The ordi nates are tlie deflexions in millimetres of the electrometer 

 needle per second. The abscissas are the distances in centimetres of the 

 polonium from the ionization chamber. Curves I, II, and III were 

 obtained when the maximum range of the alpha particle was exactly 

 ll'l centimetres in hydrogen, air, and methyl iodide, respectively. 



.Fig. 2. 



The ordinates are the deflexions in millimetres of the electrometer- 

 needle per second. The abscissae are the distances in centimetres of the 

 polonium from the ionization chamber. Curves I, II, and III were ob- 

 tained when the maximum range of the alpha particle was exactly ll'l centi- 

 metres in methane, ethyl chloride, and carbon disulphide, respectively. 



