100 
MESSRS. W. DE LA RUE AND H. W. MULLER OH THE 
because in tbe latter case the negative could not overflow the end of the tube and 
seek positive neutralization. 
Some gas let in, pressure 4 m.m., 5263 M, 2400 cells, current 0'15470 W, a well- 
defined stratification occurred when the bottom point was positive, but no oozing out 
through the holes in the tube, Plate 10, fig. 25. 
Fig. 85. 
In order to ascertain whether there w T as any difference in the increased pressure on 
the positive or negative side of the discharge on connecting the terminals with the 
battery, we had a divided bell-jar constructed as shown in fig. 85, both ends of the 
two halves being accurately ground, and a glass disc for dividing the chamber into 
parts was provided; in this there is a hole half an inch in diameter surrounded by a 
raised rim, in order that plates of mica with holes of different diameters might be 
cemented wdth Canada balsam centrally to the diaphragm. The capacity of the 
