much more difficult to destroy assertions of fancy speculation. Many an error of thought and learning has fallen before a gradual growth of thoughtful and learned opposition. But such things as the quadrature of the circle, etc., are never put down. And why? Because thought can influence thought, but thought cannot influence self-conceit: learning can annihilate learning: but learning cannot annihilate ignorance. A sword may cut through an iron bar; and the severed ends will not reunite: let it go through the air, and the yielding substance is whole again in a moment. Miracles _versus_ Nature: being an application of certain propositions in the theory of chances to the Christian miracles. By Protimalethes.[19] Cambridge, 1847, 8vo. The theory, as may be supposed, is carried further than most students of the subject would hold defensible. {7} An astronomical Lecture. By the Rev. R. Wilson.[20] Greenock, 1847, 12mo. Against the moon's rotation on her axis. [Handed about in the streets in 1847: I quote the whole:] Important discovery in astronomy, communicated to the Astronomer Royal, December 21st, 1846. That the Sun revolve round the Planets in 25748-2/5 years, in consequence of the combined attraction of the planets and their satellites, and that the Earth revolve round the Moon in 18 years and 228 days. D. T. GLAZIER [altered with a pen into GLAZION.] Price one penny. 1847. In the _United Service Magazine_ for September, 1847, Mrs. Borron,[21] of Shrewsbury, published some remarks tending to impeach the fact that Neptune, the planet found by Galle,[22] really was the planet which Le Verrier and Adams[23] had a right to claim. This was followed (September 14) by two pages, separately circulated, of "Further Observations upon the Planets Neptune and Uranus, with a Theory of Perturbations"; and (October 19, 1848) by three pages of "A Review of M. Leverrier's Exposition." Several persons, when the remarkable discovery was made, contended that the planet actually discovered was an intruder; and the future histories of the discovery must contain some account of this little afterpiece. Tim Linkinwater's theory that there is no place like London for coincidences, would have been utterly overthrown in favor of what they used to call the celestial spaces, if there had been a planet which by chance was put {8} near the place assigned to Neptune at the time when the discovery was made. EARLY IDEAS OF AVIATION. Aerial Navigation; containing a description of a proposed flying machine, on a new principle. By Daedalus Britannicus. London, 1847, 8vo.