Under the favouring auspices of that poor creature, Leopold O'Donnel, who distinguished himself during the War of Succession by the skill with which he managed to get beaten by the Carlists on nearly every possible occasion, and who now occupies the important post of Governor of Cuba--under his auspices the slave-trade is flourishing with renewed vigour. Slaves, we are told, can now be legally imported into Cuba upon payment of the governor's fee of twenty-five dollars per head, and "_la traite_ has seldom, of late years, been more successful than under the rule of this governor." One of the most striking chapters of the book before us is the one on colonial slavery, in which some curious details are given concerning the recent conspiracy of Matanzas. This outbreak, like all others that occur in the Spanish West Indies, was most falsely laid at the door of the English by the whole Spanish press. "It was directed," said they, "by a committee of five members. Placido was president, two of the other four were mulattoes, _and two Englishmen_. This latter circumstance is worthy of note." "As being an utter falsehood," observes our author. Placido, the mulatto leader of the insurrection, seems to have been a remarkable man, of commanding appearance, great energy of character, and superior intelligence. One of the means he adopted to rouse the coloured population of Cuba against their oppressors, was the writing of revolutionary songs and verses. During the whole of 1843 he was busy laying the foundations of his scheme, and, although his designs were known to thousands, no one was found to betray them. The plot was finally discovered by the conversation of some of the conspirators being overheard. An obscure warning of it, given by a young negress to her master, with whom she was in love, also led to enquiry. The project was for nothing less than the total extermination of the white race, and the formation of a republic after the example of Hayti The leading posts and commands were assigned to the mulattoes, as well during the revolt as in the organized government that was subsequently to be formed. The Thursday in Passion Week was the day fixed for the outbreak; the signal to be given by the simultaneous burning of the sugar-canes; the watchword, "_La Muerte y la Destruccion_." The domestic servants were in the plot, and were to aid in various ways. "The cooks were to poison their masters, and the caleseros, with their coach-horses, to form a corps of cavalry."