372 Prof. J. 0. McLennan on Diffusion of Actinium 



given in Table I., and the curves representing them are 

 shown in tig. 2. 



Table I. 



Pressure. 



Activity on the 

 Cathode. 



1 

 Activity on the 

 Anode. 



'5 mm. 



11-7 



11-3 



10 „ 



14-5 



14-0 



2-0 „ 



18-5 



170 



7-5 „ 



37-5 



290 



120 „ 



490 



33 



25-0 „ 



62-5 



28-5 



420 „ 



82-3 



17-7 



72-0 ,. 



920 



100 



920 „ 



910 



75 



1200 „ 



760 



5-5 



1350 „ 



730 



50 



162-0 „ 



680 



4-0 



1920 „ 



66-5 



30 



320-0 „ 



430 



115 



500-0 „ 



310 



•70 



7500 ,, 



20-5 



•45 



Fia-. 2. 



100. 200. 300. 400 300. 600. 



Pressure. in. Mm?. 



700 800 



