100 
I' 
2. EMF kept constant =4 Dan., E, and C varied. 
K = 8,000 ohms, Current = C, e = 2’16 Daniell. 
K = 4,000 
E = 2,666 
R = 2,000 
E= 1,333 
R= 1,000 
= 2C, e = 2-28 
= 3C, e = 2*32 
= 4C, e = 2-36 
= 6C, e = 2*48 
= 8C, e = 2'56 
8 . E kept constant =4,070 ohms, E and C varied. 
E = 1 Daniell, e = *92 Daniell. 
E = 2 „ 
E = 3 „ 
E = 4 
e = l-55 
e=l*85 
e = 2-13 
E = 6 Daniell, e = 2-33 Daniell. 
E= 8 „ e = 2-54 „ 
E = 10 „ 6 = 2*75 ,, 
E=12 „ 6 = 2*97 ,, 
These tables shew that e is a function of not less than two 
of the variables E, C, E. 
When one Daniell is employed to polarise the cell, there 
is a large deflection immediately on closing the circuit. It 
rapidly diminishes, however, to a very small amount, which 
indicates the existence of the “convection current” of Helm- 
holtz. This current is greater the longer the cell has been 
in use, owing, probably, to the liquid becoming more charged 
with gas. 
Depolarisation Curves for Pt foil electrodes in dilute 
H,SO„ 
After a cell containing dilute H 2 SO 4 10% had heen pola- 
rised by a battery of two Daniells, till the deflection became 
constant the battery was put out of the circuit and the 
deflection due to the polarisation produced in the cell was 
observed. During the decrease of this deflection readings 
were taken every five seconds, and the curves shown at B 
plotted out. By varying the resistance in circuit three 
curves were obtained, each of which had two points of in- 
flection.^ 
These curves never having, as far as we can ascertain, 
* Inflected curves tave recently been obtained under somewhat different con- 
ditions by C. Fromme. See Wiedemann’s Annalen, 12, 1886. 
