_Henry Diaz_, who is extolled in all the histories of Brazil, was a negro and slave. He became Colonel of a regiment of foot-soldiers, of his own color; and such was his reputation for sagacity and valor, that it was considered a distinction to be under his command. In the contest between the Portuguese and Hollanders, in 1637, Henry Diaz fought bravely against the latter. He compelled them to capitulate at Arecise, and to surrender Fernanbon. In a battle, struggling against the superiority of numbers, and perceiving that some of his soldiers began to give way, he rushed into the midst of them, exclaiming, "Are these the brave companions of Henry Diaz!" His example renewed their courage, and they returned so impetuously to the charge, that the almost victorious army were compelled to retreat hastily. Having wounded his left-hand in battle, he caused it to be struck off, rather than to lose the time necessary to dress it. This regiment, composed of blacks, long existed in Brazil under the popular name of Henry Diaz. _Antony William Amo_, born in Guinea, was brought to Europe when very young. The Princess of Brunswick, Wolfenbuttel, defrayed the expenses of his education. He pursued his studies at Halle and at Wittenberg, and so distinguished himself by his character and abilities, that the Rector and Council of Wittenberg thought proper to give public testimony of their respect in a letter of congratulation. In this letter they remark that Terence also was an African--that many martyrs, doctors, and fathers of the church were born in the same country, where learning once flourished, and which by losing the christian faith, again fell back into barbarism. Amo delivered private lectures on philosophy, which are highly praised in the same letter. He became a doctor. _Lislet Geoffroy_, a mulatto, was an officer of Artillery and guardian of the Depot of Maps and Plans of the Isle of France. He was a correspondent of the French Academy of Sciences, to whom he regularly transmitted meteorological observations, and sometimes hydrographical journals. His map of the Isles of France and Reunion is considered the best map of those islands that has appeared. In the archives of the Institute of Paris is an account of Lislet's voyage to the Bay of St. Luce. He points out the exchangeable commodities and other resources which it presents; and urges the importance of encouraging industry by the hope of advantageous commerce, instead of exciting the natives to war in order to obtain slaves. Lislet established a scientific society at the Isle of France, to which some white men refused to belong, because its founder had a skin more deeply colored than their own.