PROCEEDINGS OF SECTION B. 209 
ate column; and this is the ratio of the speeds of cation and 
anion, taking the average speed of each from the start, and is 
therefore the ratio of the specific velocities. The time read- 
ings are not necessary for this calculation, but are quoted as 
having some interest by comparison with one another. In 
each experiment the final reading corresponds to the meeting of 
the coloured boundaries. Here the position measurement was 
accurately verified by a lens and millimetre scale, after the cir- 
cuit was broken. Th other positions were estimated by eye to 
the nearest half-millimetre, the divisions of the scale of the tube 
being 5mm. apart. The time readings were to the nearest half 
minute. 
TABLE I, 
Exp. 1. XK Cl. Mean Temp. 14.8”. 
Advance of Yellow Advance of Blue Time from Ratio of 
Boundary (or Cl) Boundary (Cation) Start Velocities, 
(Cm.) (Cm.) (Minutes). Cation: Anion. 
rs 1.6 oS Bee 1.07 
2 pipe Bly Re 1.10 
ney. caag 40.5 Bue 1.08 
3 aa 49.5 ht 1.07 
aoa asta 59.5 a OR 
4 4.25 69.5 23, 1.07 
4.5 4.75 SO bxd 1.06 
5 SA 92 Ee 1.06 
Bao) 5.8 104.5 ae 1.06 
5.80 6.20 114 te Lay 
Exp. Iv. X KCL Temp. 146°. 
15 1.6 vig 1.07 
2 zal 31 1.05 
2.5 2.65 39.5 1.06 
3 3.15 49 1.05 
3.5 aan 59 1.06 
4 4.25 70 1.06 
4.5 4.75 81.5 1.06 
5 Bes 94.5 1.06 
a0 5.85 108 1.06 
5.80 6.20 119.5 KOT 
Exp. III. zn Rb Cl. Temp. 15.1°. 
5 1.6 22 1.07 
ws Des 30 1.07 
2-5 2.65 38.5 1.06 
3 = Bly 48.5 1.08 
3G By be 59 1.07 
4 4.3 i 1.08 ——— 
4.5 4.9 85 1.09 y' 
5 5.4 100.5 1.08 “ 
5.5 5.95 117 1.0 e0Ds 
5.73 6.27 lpi feed 1.0 4 2 
