212 REFUTATION OF THE SALT RADICAL THEORY, 
capes. The precipitation of blue hydrated oxide doubtless arose from 
the mixing of a small portion of the two solutions," 
77. It will be admitted, that agreeably to the admirable 
researches of Faraday, there are two modes in which a vol- 
taic current may be transmitted, conduction and electro- 
Jyzation. In order that it may pass by the last mentioned 
process, there must be a row of anions and cathions forming 
a series of electrolytic atoms extending from the cathode to 
the anode. It is not necessary that these atoms should be- 
long to the same fluid. A succession of atoms, whether 
homogeneous, or of two kinds, will answer, provided either 
be susceptible of electrolyzation. Both of the liquids re- 
sorted to by Daniell, contained atoms susceptible of being 
electrolyzed. if his idea of the composition of sulphate of 
copper, and the part performed by the potassa, were ad- 
mitted for the purpose of illustration, we should, on one 
side of the membrane, have a row of atoms consisting of 
oxysulphion and copper; on the other, of oxygen and hy- 
drogen. 
78. Recurring to DanielPs own description of the elec- 
trolyzing process, above quoted, an atom of copper near the 
anode being liberated from its anion, oxysulphion, and 
charged with electricity, seizes the next atom of oxysul- 
phion, displacing and charging an atom of copper therewith 
united. The cupreous atom thus charged and displaced, 
seizes a third atom of oxysulphion, subjecting the copper, 
united with it, to the same treatment as it had itself pre 
viously met with. This process being repeated by a suc- 
cession of similar decompositions and recompositions, an 
electrified atom of copper is evolved at the membrane, 
where there is no atom of oxysulphion. Were there no 
other anion to receive the copper, evidently the electroly 
zation would not have taken place; but oxygen, on the one 
side of the membrane, must succeed to the office performed 
by oxysulphion on the other side; while hydrogen, in like 
manner, must succeed to the office of the copper. 
