This recommendation cost Las Casas dearly enough and later exposed his reputation to unjustifiable attacks, some of which even represented him as having _introduced_ negro slavery into America; others as having been betrayed by blind zeal in favour of the Indians into promoting the slave-trade at the expense of the Africans. No one more sincerely deplored his course in this matter than he himself when he realised the significance of what he had done, and the sincerity and humility of his compunction should have sufficed to disarm his detractors. The most formal accusation made by a reputable historian against Las Casas is found in Robertson’s _History of America_, vol. iii., Year 1517, in which he charges the apostle of the Indians with having proposed to Cardinal Ximenez to purchase a sufficient number of negroes from the Portuguese settlements on the coast of Africa and to transport them to America in order that they might be employed as slaves in working in the mines and tilling the ground. Cardinal Ximenez however, when solicited to encourage the commerce, peremptorily rejected the proposition because he perceived the iniquity of reducing one race of men to slavery when he was consulting about the means of restoring liberty to another. But Las Casas, from the inconsistency natural to men who hurry with headlong impetuosity towards a favourite point, was incapable of making the distinction. While he contended earnestly for the liberty of the people born in one quarter of the globe, he laboured to enslave the inhabitants of another region and in the warmth of his zeal to save the Americans from the yoke, pronounced it to be lawful and expedient to impose one still heavier on the African. Language could hardly more completely travesty the facts, for Las Casas neither “laboured to enslave the inhabitants of another region” nor did he “pronounce it lawful” to increase slavery amongst the Africans. The moral aspect of the question of slavery was not under consideration and the recommendation of Las Casas is seen upon examination to reduce itself to this: he advised that Spanish colonists in America should be allowed the privilege, common in Spain and Portugal, of employing negro slave labour on their properties. Since Spaniards might hold African slaves in Spain, it implied no approval of slavery as an institution, to permit them to do the same in the colonies. Las Casas was engaged in defending a hitherto free people from the curse of a peculiarly cruel form of slavery, but had he regarded the institution as justifiable in itself, he would have modified the ardour of his opposition to its extension.