1370 
which easily oxidizes. This, however, is not the case. When a used 
solution which yields constant values for the scattering, is shaken 
with air till all the lead has been oxidized, the true value is found 
all the same in this oxygenous solution. 
Besides a too low value is found when the electrolysis is long 
continued, and also when an electrode, which has served for an 
experiment, is removed from the bath, dried, and used again. 
When all these influences were known, it was easy to find pretty 
constant values for the power of scattering, when the experiment 
was made under the following circumstances: Electrodes of pure 
KanrBaum lead, surface scraped off before every determination, short 
duration of the electrolysis (it never lasted more than three minutes), 
and a solution that had been used already a few times. 
In table I the valnes for the power of scattering d in a normal 
solution of Na,CO, have been given for different current densities 
D (in ampere per em’.). t= 150°. 
Density of current. 
Duration 
of the | 0.02 | 0.04 ; 0.08 0.16 0.32 0.64 1.28 2.56 
electrolysis 
0/30” = = = 1.3 1.50 1.61 1.66 1.66 
= 1.2 1.52 ok 15628 | 00268. mats 
= 2 = = 1.55 = = 
= = = = = 1.60 = = 
mean : n = 1.25 | 4454 | 1.60 |: 1.67. || 1667 
1/30” = = Ome) EP A ted | 150) |) 11,634] 1462 
_ 0.84 117 1425 ol (.66 1.63 
= — = 1.23 — 1.47 — 
— = 1.23 = 
mean = = 0.95 1.21 1.43 1.50 1.65 1.63 
3/0” 0.13 0.80 1.00 | 1.23 Nee) = — — 
OSO LIS O STe eli OO | ee 1280 1-30 = — au 
= a 1.20 = = £ = 
mean 0.06 0.79 1.00 1.24 1.34 — fo — 
It appears from these values that the greatest deviation between 
