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examples of this that I now remember to have seen.
The depth at which objects are visible at the bottom
of these is marvellous. A plunge from the rocky
banks of the Aachensee into its deep water is
truly “ a sensational header ; ” it seems a suicidal
pitch into mid-air from the edge of a precipice. I
had to screw up my courage considerably before
making such a dive. Floating in a boat over the
fountain of Cyane, the source of the Anapo, and
looking down at the pebbles, seen with microscopic
distinctness, forty or fifty feet below, was
suggestive of sitting in the car of a balloon.
Transparency and absence of colour were here combined.
The green Rhine and the blue Rhone are both
brilliantly clear; but their outspread waters at
Constance and Geneva lack transparency when
compared with those I have named. This and
their differences of colour are, I believe, simply
due to the minute rock particles still suspended in
them. The water merely displays the differences
in the colour of these particles.
The deepest purple or indigo lakes I have seen
are in the neighbourhood of dark slaty rocks, or
where gneiss or hornblendic material abounds. In
limestone districts, especially where the limestone
is ochreous, and amidst red and deep-yellow
sandstones,. the waters are green, almost pea-green in
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