Ionized Phosphorus Emanation in Tubes. 



41 



through tubes at a definite velocity; or, in general, on being 

 retained in any vessel, or put in contact with any barrier in a 

 definite way, for a definite time. The experiments of the 

 present paper thus relate to the absorption of condensation- 

 producing atmospheric nuclei by surfaces or by suspended 

 particles. They show, I think, that such absorption takes 

 place as though each nucleus of a nearly saturated region 



Sectional Elevation of the Colour-tube C, the Absorption-tube t and 

 appurtenances. Scale T \. 



c 



\f 



C 



c%/ 



/ 



t 



F 



\J 



travelled in the entire absence of an electric field, with a 

 velocity of about 3 millims. per second ; or, if it be put 

 roughly that \ of the total number travel in a given cardinal 

 direction, as though each nucleus had a velocity of about 

 a centimetre per second. It is curious to note how close this 

 lies to the velocity of the ion in a unit electric field. 



