such a consummation, is the comet of Encke, which it has been calculated
would come in collision with our earth after a lapse of 219 millions of
years! This calculation proceeds on the soundest principles of reasoning,
and proves not so much the safety of our globe from cometary destruction,
(for some comet, hitherto unseen by mortal eyes, may _now_ be winging its
flight directly towards our globe,) as the astonishing powers of the mind
of man, which can thus essay to penetrate the veil of futurity, and read
the destiny of a world.

But destruction to this terrestrial orb and its teeming inhabitants, may
be more speedily brought about than by a concussion with these celestial
agents. A single principle of motion annihilated, evaporation suspended,
or a component part of the atmosphere abstracted, and "final ruin would
drive her ploughshare o'er creation;" universal conflagration would
instantly ensue from the separation of the oxygen from the nitrogen of the
atmosphere,--the former exerting its native energies without control
wherever it extends,--solid rocks, ponderous marble, metals, and even
water itself, would burst into an intensity of flame, and change the
aspect of all sublunary things.

But all these vast bodies of the universe are, doubtless, kept in their
prescribed limits as with so many "reins and bridles," and when this earth
has completed its destined circles, and fulfilled the purposes for which
it was called out of nothing, it will need but the command of the glorious
Creator who at first spoke this beautiful frame into being, bliss, and
light, to return it to its primeval gloom, or bid it shine forth with new
resplendent beauty and lustre.

The "Notes of a Naturalist" are stated to be by Professor Rennie; but we
question if they have been written expressly for this volume, as we