W. G. Levison— Electrolytic Phenomena. 31 
globule frequently does part throwing off a small globule which 
runs to the anode; in all cases of repulsion the end tends to 
spread or enlarge. 
Fusible metal in hot solution of sodic sulphate, or dilute 
sulphuric acid in a glass tube, and metallic lead under fused 
chloride of sodium, in a grooved scorifier, in a muffle at a red 
heat, exhibit the same phenomena; hence they are not peculiar 
to mercury or amalgams. If, instead of a long groove as de- 
scribed, a series of five short grooves be cut (as shown in fig. 
8) so as to hold five globules of mercury in a line and the end 
globules be touched by the terminal wires (as shown in fig. 4), 
on making connection they become almond-shaped (as shown 
in fig. 5). The positive globule extends toward the negative 
pole, the other four all extend toward the positive pole. 
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If the terminal wires be touched to the second and fourth 
globules, the second being positive, extends toward the nega- 
tive pole, the middle and fourth extend toward the positive 
pole, and the end globules though not included in the circuit 
extend toward the center. (See fig. 6.) These are fine exper- 
iments to project before an audience, and they may be greatly 
varied. 
In both these cell experiments small globules that lie on the 
plane surface of the glass move either against the rim of the 
cell, or in smaller semi-circles concentric with it from the posi- 
tive to the negative pole, or toward the end at which hydrogen 
bubbles are escaping. The curves in which these globules 
move, may be conveniently regarded as lines of voltaic force, and 
the space between and surrounding the electrodes as the vol- 
tare field. If the mereury used in these experiments contain the 
least. trace of zinc or other metal, the phenomena will be con- 
siderably modified. 
en sodium amalgam is substituted for pure mercury as 
the negative globule in the single globule experiment, it is 
always at first repelled as though it had previously been the 
hegative terminal, and then the poles had been reve 
