Ions produced by Rontgen Rays. 75 



straight lines if produced will intersect the vertical axis 

 in a common point. 



From this it is concluded that the air curve OAB is the 

 sum of two curves OCD and OE, where OE is parallel to 

 PB and OCD approaches a line through PD parallel to 

 the pressure axis. In a similar way the curve OFG is the 



Fig. 4. 



600 



PRESSURE 



800' 



sum of the curves OJ parallel to PG and OHD, which also 

 approaches PD. Curves OE and OJ are due to ionization 

 produced by the Rontgen rays in the gas, and the curves 

 OCD and OHD are due mainly to corpuscular radiation 

 from the plates which is completely absorbed at a definite 

 pressure. After replacing the lead screens MM' and NN' 

 so as to confine the X-rays between the electrodes A and B, 

 the series of readings was repeated and found to give the 

 straight lines OE and OJ. Throughout the rest of the 

 investigation the rays were restricted between the electrodes 

 so as to avoid corpuscular radiation. 



Experimented Results. 



There is reason to believe that certain peculiar conditions 

 are present in the initial stages of recombination. On this 

 account it was thought advisable not to use formula (2), 



