Partly diverted from the original object of prosecuting discoveries along the African coast, by the attentions requisite for forming this first establishment of modern colonization, but chiefly owing to the extreme difficulties of the navigation in the infancy of that art, fifteen years were passed from the first discovery of Cape Bojador before that formidable obstacle could be surmounted. In all ages of the world, ignorant and indolent men have represented new and unusual enterprises in scientific pursuits as rash or improper deviations from the established experience and vaunted wisdom of antiquity; and those who promoted them have been held out as dangerous, or even impious innovators. It so fared with Don Henry, who far outstripped the science, or ignorance rather, of his day. At home, the discontented spirits, ignorant of his enlarged views, perhaps envious of the reputation his very limited discoveries had already attained, represented that the tempestuous seas, strong currents, and whirlpools, which they fancied must prevail on the other side of Cape Bajadore, would necessarily destroy every vessel which should attempt to penetrate beyond that absolute limit of human navigation; they alleged that all the country to the south of that cape was utterly unfit for the habitation of mankind, sterile, burnt up, and destitute of soil and water, like the sandy deserts of Lybia; and they pretended to object on principles of patriotism, that the natives of Portugal were improvidently wasted on idle discoveries, which, if at all advisable, would have been undertaken by their former, wise sovereigns; who, contented with the known world, did not, vainly seek for conquests in the torrid zone, which was altogether unfit for the habitation of mankind. They insinuated, that the expences which had been lavished upon those fruitless and dangerous maritime expeditions, might lave been much more profitably employed for the improvement of some of the more barren parts of Portugal. Even the probable profits and advantages derivable from the new colonies of Madeira and Puerto Santo, as they were only eventual and contingent, did not satisfy the minds of those discontented detractors from the merits and enlightened views of the prince. But Don Henry despised those vain endeavours to misrepresent and counteract the important enterprise in which he was engaged, and undismayed by the natural difficulties which had hitherto retarded the progress of his mariners, continued his laudable endeavours to extend his discoveries along the coast of Africa. The people, likewise, whom he employed in his service, frequently made predatory invasions on the coast, taking every Moorish vessel which they were able to master, and made many slaves, by the sale of which, the charges attending those maritime expeditions were partly defrayed.