452 G. Bar us — Ions and Nuclei in Dust-free Air. 



that the ions or fleeting nuclei are such loose aggregates 

 built up out of colloidal nuclei, because evidence of the pres- 

 ence of colloidal nuclei absent at the low ionizations (exposure 

 to weak radiation) is manifest at the high ionizations (exposure 

 to intense radiation). If the radiation is very strong all sizes 

 are represented, showing that the aggregates are virtually 

 built up out of continually smaller colloidal nuclei probably 

 closely approaching the molecular sizes, while at the same 



TV ^TZT= Zf -~zg i% SO iz 34 3U 



Fig. 2. — Charts for Table III showing the rmcleation n in terms of the 

 super saturation (pressure drop dp), for dust-free non-energized air, and for 

 dust-free air energized by radium (10,000 x , 10 mg.) from different distances 

 D. The dotted curves show, the corresponding cases (Dust-free air, A; 

 Eadium, R ; X-rays, X.) for less rapid exhaustion (Table I). The vertical 

 spaces represent 20,000 nuclei each. 



