ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERV. 73 
In order to obtain a smooth curve for the observations beyond the minimum of 
resistance of the tube, they were again plotted down so as to make the abscissse 
represent relatively the mean distance of the molecules at the various pressures, as in 
%• 73, which is a reduction of the original diagram to one-third ; this has the effect 
of extending the scale for this portion of the curve, while it compresses the scale on 
the opposite side for increasing pressures. 
The following were read off:— 
A 
V. 
Pressure. 
Cells. 
Decrease per 
10 M increase. 
Pressure. 
Cells. 
Decrease per 
10 M increase. 
M. 
cells. 
M. 
cells. 
8 
9600 
11,400 
90 
5280 
135 
9 
8460 
9600 
100 
5145 
94-5 
10 
7500 
420 
200 
4200 
60 
20 
7080 
358 
300 
3600 
48 
30 
6722 
332 
400 
3120 
45 
40 
6390 
300 
500 
2670 
39 
50 
6090 
270 
600 
2280 
45 
60 
5820 
195 
700 
1830 
51 
70 
5625 
180 
800 
1320 
16 
80 
5445 
165 
900 
90 
5280 
1000 
1000 
The various phenomena of stratification observed in tube 162 during the course of 
the preceding series of measurements of tube-potential were very similar to those 
already described under like conditions in tubes 129 and 139 containing residual 
hydrogen, in Part II., and represented in plates 15 and 16 of that part. Sketches 
were made of the various forms of strata, but it would not have been possible to take 
photographs of these phenomena, as this would have seriously interfered with the con¬ 
tinuity of the measurements and have prolonged their duration disadvantageously for 
the battery. A particular phase worthy of record was, however, observed which had 
been seen before with tube 145, and which has been described in Part II., experiment 
218, page 215. Of this and two preceding phases, photographs were taken and are 
shown in Plate 9, figs. 1 , 2, and 3. The pressure in all three cases was O'747 m.m., 
983 M ; the current was not measured, but the potential used was 4800 cells. On 
making the straight wire negative, the appearance shown in fig. 1 was seen : this 
is copied from a photograph obtained in 5 seconds. 
'MDCCCLXXX. 
L 
