Herschel, in calling his newly-discovered planet by the name of his patron, was not without illustrious precedents for so doing. When Galileo discovered the four Satellites of Jupiter, in the year 1610, he named them the _Medicea Sidera_, in honour of the family of Medici, his patrons. And Cassini, who, in the years 1671, 1672, and 1684, successively, discovered the fifth, the third, and the first and second Satellites of Saturn, denominated these stars, _Sidera Lodoicea_, in honour of Louis XIV. in whose reign, and observatory, they were first discovered. The fourth Satellite of Saturn (but the first of them, in the order of time, that was known) had been previously discovered by Huygens, sixteen years before any one of the others was known to exist. Footnote 85b: So written by Lalande. There is an Asiatic island called _Panay_: it is one of the Philippines, and lies, as _Panchay_ is said to do, “to the east of Africa.” Footnote 85c: “Herschel, with ample mind and magic glass, Mid worlds and worlds revolving as they pass, Pours the full cluster’d radiance from on high, That fathomless abyss of Deity.” _Purs. of Lit._ dial. the fourth. ----- Further improvements may also be expected to take place, in the construction of watches and other spring-chronometers; so as to render them still more useful for the purposes of navigation, by ascertaining with greater precision the longitude at sea.[86] For this purpose, the finely-improved English time-keepers of Harrison, Mudge, and others, have been found of the greatest utility. Mr. de Zach, (in his Explanation and uses of the Tables of the Motions of the Sun,[87]) after some observations on determining differences of longitude by means of astronomical observation, says,[88]—“De cæteris longitudinem determinandi modis, non est hic disserendi locus;—de uno vero, horologiâ maritimâ seu nauticâ, quidquam adjicere non alienum erit. Triginta jam abhinc annis, ingeniosissimi horologiorum artifices, Harrison, Cummings, Kendal, Arnold, Mudge, apud Anglos,—Le Roy et Berthoud apud Gallos, varia navigantium usui, egregia excogitaverant, et ad magnum perduxerant perfectionis gradum, horologia nautica, (Anglis, Time-keeper.) Cum eorum in longitudinibus itenere maritimo definiendis, usum quisque norit, plura hic dicere abstineo; simile horologium ab ingenioso horolopega Thom. Mudge constructum, in Observatorio Regio Grenovicensi sæpius exploratum, anno 1784, a Clar. D. Campbell, classis navalis præfecto[89] ad Terram Novam (Newfoundland) vectum, et reductum, ab hoc tempore in Observatorio Excellentissimi Comitis de Bruhl, Londini, Doverstreet, assidue observatum est. Hoc ipsum horologium maritimum, anno 1786, in terrestribus, iteneris longitudines determinandi gratia, concreditum mihi fuit, cum â Serenissimo Duce Saxe-Gothanâ, omnium scientiarum