396 Prof. C. Barus on the Transmission of the 



of particles per cub. centim. supplied. Compatibly with the 

 direct experiments just discussed, however, the cause is 

 probably incidental. 



Table II. 



Leakage due to Phosphorus Emanation. V = V 10 -C ''. 



Absorbent 

 Medium. 



Dis- 

 tance 

 apart. 



Time. 



Observed 

 Potential 

 Diiference. 



Computed 

 Potential 

 Difference. 



c\ 



! 

 Date. 



t. 



Air. 



cm. 

 4 



h m 

 10 



10 



15 



m. 

 



10 



15 



volts. 

 400 



39-0 



390 





•0007 



Air saturated 

 with phos- 

 phoric "dust." 



4 



20 



10 27 



28 

 29 



20 





 1 



2 



38-6 



39 

 35 

 32 



volts. 

 39 



36 



33 



•0360 







30 



3 



29 



31 









31 



4 



27 



28 









32 



5 



25 



26 









33 



6 



23 



24 









34 



7 



21 



22 









35 



8 



20 



20 









36 



9 



19 



19 









37 



10 



17 



17 









. 38 



11 



16 



16 









39 



12 



16 



15 









40 



13 



15 



13 









46 



19 



13 











51 



24 



13 











57 



30 



9 







7. I come now to the main purpose of the present paper, 

 namely, to find and to explain the decrease of the leakage c' 

 of the condenser, when the plates are separated. This is 

 equivalent to finding the change of n the number of particles 

 per cubic centim. with the distance between the condenser- 

 plates. The farther away the ions move normally from the 

 condenser-plate the fewer will have survived, whether this 

 be due to mutual destruction or other decay, or to the escape 

 of particles laterally out of the condenser. 



