Those recent visitors to Cuba who have written of what they there saw, have in few instances done more than glance at the subject. They have either treated it superficially, like M. Marmier, who, in his love of locomotion and eagerness to get afloat again, dismisses the Pearl of the Antilles in three or four hasty chapters; or, like Mr Taylor, their opportunities of investigation have been limited to a small portion of the island. Mr Madden's little volume is of a special and statistical class; and, as far as it goes, we think well of it, notwithstanding the attack made upon it by Mr Taylor, who is shocked at the faulty spelling of Spanish words and names, and who laughs at Mr Madden for deprecating the annexation of Cuba to the States, which he (Mr Taylor) inclines to advocate. Madame de Merlin's work is much more copious and comprehensive than any of the three above named; but if her sketches of Havanese society and manners are pleasing and characteristic, her descriptions of scenery vivid, and her retrospective historical chapters careful and scholarly, on the other hand she is frequently biassed, when touching on matters of greater practical importance, by the joint prejudices of a Frenchwoman and of a Spanish Creole; whilst her sex necessarily precluded her from acquaintance with various phases of Spanish colonial life, and from exploring those wilder districts, an account of which is essential to the completeness of a work on Cuba professing thoroughly to describe the island and its motley population. For such a work there is abundant room; and of such a one, in this century of intelligent and enterprising travellers, we confidently hope before long to welcome the appearance. ONWARD TENDENCIES. TO AUGUSTUS REGINALD DUNSHUNNER, ESQ. OF ST MIRRENS. MY DEAR DUNSHUNNER,--Is it too great a liberty to inquire into the nature of your present avocations, or to ask if you are occupied with any magnificent scheme to take the public mind by storm? You have of late maintained so mysterious and obstinate a silence, that your friends are becoming anxious regarding you. Like Achilles, son of Peleus, you seem to be sulking in your tent, whilst all the rest of the Greeks are abroad in the clear sunlight, making head against the Trojan army, and skirmishing in the front of their ships. We miss you, and the public miss you. Your red right arm was wont to be seen far in front of the battle fray, and, at the moment when the political strife is hottest, we cannot afford to lose the countenance of our bravest champion. I hope there is no Briseïs in the case? If so, tell us which of the Free-Traders has wronged you, and the damsel shall be immediately restored, with a corresponding recompense of plunder.