If Spain, then, failed to leave her colonies with the internal force or the system capable of re-organizing their independent society, the plan immediately suggests itself of applying to them the rules which have constructed a firm and harmonious civilization where the Anglo-American has found himself on the same soil with one of the colored races. The introduction of negro-slavery into Nicaragua would furnish a supply of constant and reliable labor requisite for the cultivation of tropical products. With the negro-slave as his companion, the white man would become fixed to the soil; and they together would destroy the power of the mixed race which is the bane of the country. The pure Indian would readily fall into the new social organization; for he does not aim at political power, and only asks to be protected in the fruits of his industry. The Indian of Nicaragua, in his fidelity and docility, as well as in his capacity for labor, approaches nearly the negroes of the United States; and he would readily assume the manners and habits of the latter. In fact the manners of the Indian toward the ruling race are now more submissive than those of the American negro toward his master. Some, however, may urge that the climate of tropical America is unfavorable to the African negro. This idea has been set afloat by some statistics a British officer has published in reference to the comparative vitality of the European and negro regiments in Jamaica. The figures, as given, go to show, that the average mortality is greater among the negro than among the European regiments; and even Dr. Josiah C. Nott has been led to quote the statistics with approval, and to infer that tropical America is not suited to the African. But the figures of the British officer may be read in another sense, and probably with a nearer approach to natural laws. It is not the climate, but the profession of soldier, which destroys so rapidly the negro regiments of Jamaica. No avocation of life requires so much intelligence, so much knowledge of the laws of life, and so much resolution and self-denial in adhering to them, as that of the soldier. The great difference between a veteran and a raw recruit is, that one knows how to take care of himself, and the other does not. But you never can make a veteran of the negro; he remains always in the condition of recruit, and hence negro regiments will have the health and vitality of regiments of recruits. No one, who has seen the negro in tropical America, will, for a moment, allow the accuracy of the deduction, hastily drawn from the regimental returns of Jamaica.