520 
HON. R. J. STRUTT ON THE CONDUCTIVITY 
Diagram No. 4. —Polonium, prepared by Sir W. Crookes. 
Pressure, mm. of Mercury. 
range. The radiation from this polonium preparation appears to be more penetrating 
than that from the other. 
The next table gives tlie relative conductivities found with this radiation. 
Gas. 
Relative conductivity (air =1). 
Separate determinations. 
Mean. 
Hydrogen .... 
•232 -222 -213 -210 
•219 
■216 
Sulphur dioxide . . 
1-99 2-15 — 2-12 
2-03 
Methyl iodide . . . 
3-44 5-48 — 3-51 
3-47 
The mean values do not differ much from those found for the other sample of 
polonium. There is not, I think, any evidence that the relative conductivities are 
not exactly equal in the two cases. 
