Marshals at the Tuileries.----ARMAND MARRAST, who acquired distinction as editor of the _National_ and by his close connection with the provisional government of 1848, died March 10.----The President has offered a prize of fifty thousand francs in favor of the author of the discovery which shall render the pile of Volta applicable with economy, whether to industrial operations, as a source of heat, or to illumination, or to chemistry, or to mechanics, or to practical medicine. Scientific men of all nations are admitted to compete for the prize. The competition shall remain open for the space of five years.----He has also presented to M. Leon Foucault, the young _savant_ of Paris, distinguished for his works on electricity and light, and especially for the experiment with the _pendulum_ illustrative of the earth's rotary motion, the sum of ten thousand francs. On the 21st of March, the President reviewed the troops, and bestowed upon them the medal, instituted by the confiscation of the Orleans estates. In the speech which he made to them upon the occasion, he said, his object in instituting this medal was to make some more adequate compensation for the services of the army, than they usually received. It secures to each soldier, who shall have it, an annuity of 100 francs for life; the sum is small, but the evidence of merit, which the medal carries with it, adds to its value. He urges them to receive it as an encouragement to maintain intact their military spirit. "Wear it," he says, "as a proof of my solicitude for your interest, and my affection for that great military family of which I am proud to be the head, because you are its glorious children." The demands of France upon BELGIUM were mentioned in our last Record. It is stated that they have been boldly met and repelled. The King of Belgium at once made an appeal to England and the Continental courts, and he has received from all the European Powers the most positive assurance that they will not suffer any aggressive step whatever of Louis Napoleon against Belgium. The French Cabinet had required the Belgian Government to remove the Lion which had been placed on the field of Waterloo; but that demand was refused. It is said, upon reliable authority, that the "decree" for annexing Belgium to France had been prepared and even sent to the _Moniteur_ for publication; and was only withdrawn in consequence of the strenuous opposition of those who have more prudence than the President, and who fortunately possess some influence over him.