The existence of this new Republic was inaugurated by striking the fetters from the slaves in Porto Rico. This beneficent measure was followed by the release of several thousand persons illegally held as slaves in Cuba. Next, the Captain-General of that colony was deprived of the power to set aside the orders of his superiors at Madrid, which had pertained to the office since 1825. The sequestered estates of American citizens, which had been the cause of long and fruitless correspondence, were ordered to be restored to their owners. All these liberal steps were taken in the face of a violent opposition directed by the reactionary slave-holders of Havana, who are vainly striving to stay the march of ideas which has terminated slavery in Christendom, Cuba only excepted. Unhappily, however, this baneful influence has thus far succeeded in defeating the efforts of all liberal-minded men in Spain to abolish slavery in Cuba, and in preventing the promised reform in that island. The struggle for political supremacy continues there. The proslavery and aristocratic party in Cuba is gradually arraigning itself in more and more open hostility and defiance of the home government, while it still maintains a political connection with the Republic in the peninsula; and although usurping and defying the authority of the home government whenever such usurpation or defiance tends in the direction of oppression or of the maintenance of abuses, it is still a power in Madrid, and is recognized by the Government. Thus an element more dangerous to continued colonial relations between Cuba and Spain than that which inspired the insurrection at Yara--an element opposed to granting any relief from misrule and abuse, with no aspirations after freedom, commanding no sympathies in generous breasts, aiming to rivet still stronger the shackles of slavery and oppression--has seized many of the emblems of power in Cuba, and, under professions of loyalty to the mother country, is exhausting the resources of the island, and is doing acts which are at variance with those principles of justice, of liberality, and of right which give nobility of character to a republic. In the interests of humanity, of civilization, and of progress, it is to be hoped that this evil influence may be soon averted.