contrived and skilfully executed, is not always successful, their
enemies often discovering their hiding place. We happened to see a
remarkable instance of this last summer (1828), in a case of one of the
lilac caterpillars which had changed into a chrysalis within the closely
folded leaf. A small cuckoo-fly, aware, it should seem, of the very spot
where the chrysalis lay within the leaf, was seen boring through it with
her ovipositor, and introducing her eggs through the punctures thus made
into the body of the dormant insect. We allowed her to lay all her eggs,
about six in number, and then put the leaf under an inverted glass. In a
few days the eggs of the cuckoo-fly were hatched, the grubs devoured the
lilac chrysalis, and finally changed into pupae in a case of yellow
silk, and into perfect insects like their parent.--_Library of
Entertaining Knowledge_.

The last extract, and all in the Library of Entertaining Knowledge
signed J.R. are written by Mr. J. Rennie, whose initials must be
familiar to every reader as attached to some of the most interesting
papers in Mr. Loudon's Magazines. He is a nice observer of Nature, and
one of the most popular writers on her phenomena.

As we treated the cuts of the last portion of the "Library of
Entertaining Knowledge," rather critically, we are happy to say that
the engravings of insects in the present part make ample amends for all
former imperfections in that branch of the work; some of the pupae,
insects, their nests, &c. are admirably executed, and their selection
is equally judicious and attractive.

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