This mode of framing names from the names of persons to whom it was intended to do honour, has been employed also in the mathematical and chemical sciences; but such names have rarely obtained any permanence, except when they recorded an inventor or discoverer. Some of the constellations, indeed, have retained such appellations, as _Berenice's Hair_; and the new star which shone out in the time of Cæsar, would probably have retained the name given to it, of the _Julian Star_, if it had not disappeared again soon after. In the map of the Moon, almost all the parts have had such names imposed upon them by those who have constructed such maps, and these names have very properly been retained. But the names of new planets and satellites thus suggested have not been generally accepted; as the _Medicean_ stars, the name employed by Galileo for the satellites of Jupiter; the _Georgium Sidus_, the appellation proposed by Herschel for Uranus when first discovered[40\4]; Ceres _Ferdinandea_, {306} the name which Piazzi wished to impose on the small planet Ceres. The names given to astronomical Tables by the astronomers who constructed them have been most steadily adhered to, being indeed names of books, and not of natural objects. Thus there were the _Ilchanic_, the _Alphonsine_, the _Rudolphine_, the _Carolinian_ Tables. Comets which have been ascertained to be periodical, have very properly had assigned to them the name of the person who established this point; and of these we have thus, _Halley's_, _Encke's Comet_, and _Biela's_ or _Gambart's Comet_. [Note 40\4: In this case, the name _Uranus_, selected with a view to symmetry according to the mythological order of descent of the persons (_Uranus_, _Saturn_, _Jupiter_, _Mars_) was adopted by astronomers in general, though not proposed or sanctioned by the discoverer of the new planet. In the cases of the smaller planets, _Ceres_, _Pallas_, _Juno_, and _Vesta_, the names were given either by the discoverer, or with his sanction. Following this rule, Bessel gave the name of _Astræa_ to a new planet discovered in the same region by Mr. Hencke, as mentioned in the additions to book vii. of the _History_ (2nd Ed.). Following the same rule, and adhering as much as possible to mythological connexion, the astronomers of Europe have with the sanction of M. Le Verrier, given the name of _Neptune_ to the planet revolving beyond Uranus, and discovered in consequence of his announcement of its probable existence, which had been inferred by Mr. Adams and him (calculating in ignorance of each other's purpose) from the perturbations of Uranus; as I have stated in the Additions to the Third Edition of the _History_.]