This is a very remarkable, though a very common fact. The molecules in
the centre of the liquid are so hampered by the action of their
neighbours that freedom to follow their own tendencies is denied to
them. Fix your mind's eye upon a molecule within the mass. It wishes
to unite with its neighbour to the right, but it wishes equally to
unite with its neighbour to the left; the one tendency neutralizes the
other and it unites with neither. But, if a crystal of sulphate of
soda be dropped into the solution, the molecular indecision ceases. On
the crystal the adjacent molecules will immediately precipitate
themselves; on these again others will be precipitated, and this act
of precipitation will continue from the top of the flask to the
bottom, until the solution has, as far as possible, assumed the solid
form. The crystals here produced are small, and confusedly arranged.
The process has been too hasty to admit of the pure and orderly action
of the crystallizing force. It typifies the state of a nation in which
natural and healthy change is resisted, until society becomes, as it
were, supersaturated with the desire for change, the change being then
effected through confusion and revolution.
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