I much regret having, for this year at least, lost a sight here, which I should have viewed with no inconsiderable degree of attention. This is the PUBLIC EXHIBITION OF THE PRODUCTIONS OF FRENCH INDUSTRY. Under the directorial government, this exhibition was opened in the _Champ de Mars_; but it now takes place, annually, in the square of the _Louvre_, during the five complementary days of the republican calendar; namely, from the 18th to the 22d of September, both inclusive. The exhibition not only includes manufactures of every sort, but also every new discovery, invention, and improvement. For the purpose of displaying these objects to advantage, temporary buildings are erected along the four interior walls of this square, each of which are subdivided into twenty-five porticoes; so that the whole square of the _Louvre_, during that period, represents a fair with a hundred booths. The resemblance, I am told, is rendered still more perfect by the prodigious crowd; persons of all ranks being indiscriminately admitted to view these productions. Precautions, however, are taken to prevent the indiscreet part of the public from rushing into the porticoes, and sentinels are posted at certain intervals to preserve order. This, undoubtedly, is a very laudable institution, and extremely well calculated to excite emulation in the national manufactures, specimens of which being sent from all the principal manufacturing towns, the hundred porticoes may be said to comprise an epitome of the present state of all the flourishing manufactures of France. Indeed, none but new inventions and articles of finished workmanship, the fabrication of which is known, are suffered to make part of the exhibition. Even these are not admitted till after a previous examination, and on the certificate of a private jury of five members, appointed for that purpose by the prefect of each department. A new jury, composed of fifteen members, nominated by the Minister of the Interior, again examine the different articles admitted; and agreeably to their decision, the government award premiums and medals to those persons who have made the greatest improvement in any particular fabric or branch of industry, or produced any new discovery or invention. The successful candidates are presented to the Chief Consul by the Minister of the Interior, and have the honour of dining with him at his public monthly dinner. From all that I can learn concerning this interesting exhibition, it appears, that, though the useful arts, in general, cannot at present be put in competition here with those of a similar description among us, the object of the French government is to keep up a spirit of rivalship, and encourage, by every possible means, the improvement of those manufactures in which England is acknowledged to surpass other countries.