A North-American Frenchman, named Stanislaus, last from the Havannah, has given several exhibitions at the theatre upon galvanism, slight-of-hand, &c. aided by machinery, the best I have seen of the sort. His performance was more than upon a par with our English professors. The natives declared, he must have dealings with the devil; or how could he transport handkerchiefs from the pockets of individuals in the theatre to the lofty towers of the Cabildo, in the Plaza? and this, they asserted, he had done. Stanislaus was rewarded with good houses. His pronunciation of the Spanish language excited bursts of laughter; it was a mixture of Spanish, French, and English. A Lecture on Astronomy was attempted; but it did not meet with the success it merited, either from a want of taste for this instructive science, or that the audience conceived the theatre an improper place. The lecturer reading his part, diminished the effect. * * * * * An Englishman (Bradley) has a CIRCUS, which is sometimes open on Sunday afternoons, and on saints' days. Bradley is a decent horseman and clown; but he has to contend with many disadvantages. * * * * * BRITISH RESIDENTS.--Before entering into a detail of the manners and customs of the native or Spanish part of the population, I shall take some notice of the various FOREIGNERS who have become residents in this city. Of these the most numerous are the ENGLISH: I have heard, that the province of Buenos Ayres contains, of men, women, and children, 3500 British individuals, according to a census taken in 1822. The British merchants are a respectable body in Buenos Ayres: the commerce of the country is chiefly in their hands; and, taking the clerks, servants, and others employed in their barraccas, or hide warehouses, as well as in their houses, the numbers are very imposing. Most houses have a Spanish clerk, who (as well as his English brethren) generally boards and lodges in the house. The following is a list of the British mercantile establishments at present existing in Buenos Ayres:--