04 
MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
as represented, and disappeared on the negative. On falling the least degree 
lower the potential was too small to maintain a current and the tube went 
out. Although a potential of 1350 cells kept up the current it could not be 
started again until the condenser had acquired a much higher one. 
188. — On connecting the condenser again with the battery it produced at 
70 divisions, 2954 cells, with the same resistance, beautiful double strata, as 
4, fig. 58. 
189. — The same phenomena as described in 185 were again obtained when the 
potential had fallen to 42 divisions, 1720 cells. This tube was characterized 
by the number of the strata decreasing as the potential fell. 
Tube 105, 27 inches long, 24 inches between the two straight terminals, 
diameter 2'25 inches. 
Cyanogen. 
190. — With a potential of 78 divisions, produced by 3240 cells, there were 
twelve and a half strata. 
With a potential of 45 divisions, 1898 cells, 13-Jr strata. 
,, „ 32 ,, 1350 ,, a rapid flow. 
„ „ 28 „ 1181 „ the current ceased. 
Tube 106, about the same dimensions as 105. 
Carbonic Acid and Bromine. 
191. — When the potential of the condenser was 70 divisions, 2953 cells, beautiful 
tongue-shaped strata were produced, which receded from a sheet of tin foil 
held in the hand and laid on the tube. At a potential of 58 divisions, 2447 
cells, a transition took place from tongues to discs ; at a potential of 42 
divisions, 1772 cells, the current ceased. 
Tube 104, 23*5 inches between two straight terminals, diameter 2 '5 inches. 
Bromine and Nitrogen. 
192. — The same arrangement of condenser of 42*8 m.fi, and 3240 cells, 680,000 
ohms being introduced in the circuit ; at a potential of 65 divisions, 2742 cells, 
beautiful tongue-shaped strata were produced; at 48 divisions, 1603 cells, 
the strata became confused ; at 35 divisions, 2109 cells the current ceased. 
193. — On another occasion, with a battery of 2160 cells, and the same condenser, 
a resistance of 400,000 ohms being inserted in the circuit, when the electro- 
meter indicated 135 divisions (not of the same value as the preceding), 
tongue-shaped strata were produced; when the tension had fallen to 110 
