BURCKHARDT, one of the associated members of the Bureau des Longitudes, is a first-rate astronomer and a man of superior talent. He is at present employed on the difficult task of calculating the very considerable derangements of the planet discovered by OLBERS at Bremen, on the 28th of March 1801.

VIDAL has made, at Mirepoix, more observations of Mercury than all the astronomers for two thousand years past, and these are the most difficult and uncommon.

DELAMBRE has computed tables of the Sun, of Jupiter, of Saturn, and of Herschel; LALANDE, the nephew, has composed tables of Mars; and his uncle, of Mercury, which never deviate more than a few seconds from the observations.

Even during the reign of terror, astronomy was not neglected. Through the interest of CARNOT, CALON, LAKANAL, and FOURCROY, the Bureau de Consultation des Arts gave annually the sum of 300,000 francs (circa £12,000 sterling) in gratifications to artists.

Afterwards, in 1796, the National Institute, richly endowed, proposed considerable premiums. LALANDE, the uncle, founded one for astronomy; BONAPARTE, another for physics; and the First Consul has promised 60,000 francs (circa £2,800 sterling) to any one who shall make a discovery of importance.

France can now boast of two young geometricians, BIOT and PUISSON, who, for analytical genius, surpass all that exist in Europe. It is rather extraordinary that, with the exception of Mr. CAVENDISH and Dr. WARING, England has produced no great geometricians since the death of MACLAURIN, STERLING, and SIMPSON.

The French tables of Logarithms, printed stereotypically, are cleared of all the errors which afflicted calculators of every country. Those of other nations will owe this obligation to Frenchmen.

HERSCHEL no longer looks for comets; but the French astronomers, MESSIER, MÉCHAIN, BOUVARD, and PONS find some. Last year, JÉROME LALANDE deposited 600 francs in the hands of his notary, as a premium to stimulate the efforts of young observers.

February 11, in continuation.

In the spring of 1803, MÉCHAIN will leave Paris for the purpose of extending his meridian to the Balearic Islands. He will measure the length of the pendulum in several places, in order to ascertain the inequality of the earth which the measure of the degrees had indicated. This circumstance reminds me of my neglect in not having yet satisfied your desire to have a short account of the means employed for fixing the standard of the