Mr. Jennings's volume is
therefore well adapted for presentation to young persons; whilst the
knowledge which it displays, entitles it to a much higher stand than a
mere book of amusement. To illustrate what we have said in its praise,
the reader will find in the _Supplement_ to the present Number, two
or three of the most attractive _Notes_ under "THE NATURALIST,"
which likewise contains _Three Engravings_ of very curious subjects
in other departments of Natural History.
* * * * *
CONVERSATIONS ON GEOLOGY.
We have already spoken in favourable terms of this volume. It consists
of 15 conversations of a family circle, comprising a familiar explanation
of the Huttonian and Wernerian systems; the Mosaic geology, as explained
by Penn; and the late discoveries of Buckland, Humboldt, Macculloch, and
others. By way of specimen, we take a portion of a conversation which
introduces the very interesting subject of the _formation of coal_:
_Edward_.--As the Huttonians evidently fail in proving coal to be
produced by fusion, I hope the Wernerians may succeed better, for I
should be sorry if so interesting a subject were left unexplained.
_Mrs. R._--To understand their account, it will be requisite for
you to recollect the process of the formation of bogs and marshes, as it
is from these that Werner derives coal.
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