ELECTRIC DISCHARGE WITH THE CHLORIDE OF SILVER BATTERY. 185 
66. — Pressure 3'6 m.m., 4737 M, 4800 cells. Strata resembling 58, fig. 46, but 
near the negative the strata were indistinct. In the rotating mirror the 
distinct strata were steady, but in the indistinct portion there was indicated 
a rapid flow towards the positive. The fines C, F, and G seen in the glow 
around negative terminal, but C and G were not seen in the strata. 
67. — Pressure 1'2 m.m., 1579 M, 2400 cells, C. 0’03251 W. 11 narrow strata, 
umbrella-shaped, about § of inch wide, followed by two about 1^ inch wide, 
then a confused discharge, in which the rotating mirror showed a rapid 
flow towards the positive. C, F, and G fines visible in the negative glow ; 
G and C disappeared in the strata, and F was very faint. 
68. — Pressure 1*9 m.m., 2500 M, 3600 cells, C. 0'04256 W. A very beautiful phase 
like 85, fig. 46. 
Tube 129, 7 th Charge of Hydrogen. 
69. — The tube was again recharged with hydrogen. Pressure 14 ‘3 m.m., 
18,816 M, 8040 cells. A glow was seen on both terminals. 
70. — Pressure 13‘8 m.m., 18,158 M, 8040 cells, C. 0’00703 W. 2 luminosities 
resembling the right hand of 2, fig. 43. 
71. — Pressure 7 '6 m.m., 10,000 M, 8040 cells. 8 luminosities, like fig. 5, Plate 15. 
72. — Pressure 4'5 m.m., 5921 M, 8040 cells, C. 0'02881. 15 luminosities like 
fig. 7, Plate 15. In the glow around the negative terminal G, F, and C 
fines were seen, the last two brilliantly, but the luminosities gave a con- 
tinuous spectrum. 
73. — Pressure 31 m.m,, 4079 M, 8040 cells, C. 0‘03657 W. A tendency to the 
spiral formation 50, fig. 46. 
74. — Pressure 1‘2 m.m., 1579 M, 8040 cells, C. 0'04686 W. Strata like 58, fig. 46. 
75. — Pressure far below 1 m.m., 8040 cells, C. 0‘01412. 8 thickened strata like 
22, fig. 45. 
76. — The exhaustion carried still further. 8040 only passed with a faint glow, 
producing no deflection of a galvanometer which could indicate a current of 
0‘00024 W. The secondary current of Apps’s induction coil 821 passed, 
producing 6 thick strata like 22, fig. 45. 
Tube 129, 8 th Charge of Hydrogen. 
77. — Pressure 11-5 m.m., 15,132 M, 8040 cells, C. 0'00993. At first the tube 
was only faintly illuminated at the two terminals, with a barely visible glow 
throughout the tube, which became heated in the middle, then one lumi- 
nosity formed at the positive 102, fig. 46. This moved several inches from 
MDCCCLXXVIII. 2 B 
