LETTER XLV.

Object of the different learned and scientific institutions, which, before the revolution, held their sittings in the _Louvre_--Anecdote of Cardinal Richelieu--National Institute of Arts and Sciences --Organization of that learned body--Description of the apartments of the Institute--Account of its public quarterly meeting of the 15th Nivose, year X, (5th of January, 1802)--Marriage of Mademoiselle _Beauharnois_ to _Louis Bonaparte_.