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I ha ve already referred to the exceptional
transparency of the water of the Aachensee, a lake in the
Tyrol, situated about thirty miles to the north-east
of Innspruck. When there in 1855 I was much
interested in observing hundreds of trees lying down,
standing upright, and leaning at various angles, at
the bottom of its colourless and transparent water.
I bathed in the lake, swam out and dived down,
brought up several pieces of wood in various stages
of decomposition, the annual rings being’ curiously
separable by the ready decomposition of the
cambium layer between them. On the slopes of the
lake were the tracks of tree avalanches, like those
here on the Sognefjord. I read a paper on the
subject at the British Association,* which was
followed by a very interesting discussion, in which
Sir Charles Lyell, Sir Roderick Murchison,
Professor Phillips, Principal Dawson, and other
eminent geologists took part.
Subsequent observation has confirmed my
opinion there expressed, that some of our coal
seams mav have thus been formed ; I do not sav
all, being quite satisfied, from the variations in
the composition and structure of different coal
seams, that no single mode of formation is common
to all.
We steam along the Sognefjord and its
* See Report for 186“», p. 78.
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