Infectious disease was one of the grave perils with which the slavers had to reckon. The overcrowding of the slaves, the lack of exercise and fresh air, the wretched and insufficient food, all combined to make grave, general sickness an incident of almost every voyage, and actual epidemics not infrequent. This was a peril that moved even the callous captains and their crews, for scurvy or yellow-jack developing in the hold was apt to sweep the decks clear as well. A most gruesome story appears in all the books on the slave trade, of the experience of the French slaver, "Rodeur." With a cargo of 165 slaves, she was on the way to Guadaloupe in 1819, when opthalmia--a virulent disease of the eyes--appeared among the blacks. It spread rapidly, though the captain, in hopes of checking its ravages, threw thirty-six negroes into the sea alive. Finally it attacked the crew, and in a short time all save one man became totally blind. Groping in the dark, the helpless sailors made shift to handle the ropes, while the one man still having eyesight clung to the wheel. For days, in this wretched state, they made their slow way along the deep, helpless and hopeless. At last a sail was sighted. The "Rodeur's" prow is turned toward it, for there is hope, there rescue! As the stranger draws nearer, the straining eyes of the French helmsman discerns something strange and terrifying about her appearance. Her rigging is loose and slovenly, her course erratic, she seems to be idly drifting, and there is no one at the wheel. A derelict, abandoned at sea, she mocks their hopes of rescue. But she is not entirely deserted, for a faint shout comes across the narrowing strip of sea and is answered from the "Rodeur." The two vessels draw near. There can be no launching of boats by blind men, but the story of the stranger is soon told. She, too, is a slaver, a Spaniard, the "Leon," and on her, too, every soul is blind from opthalmia originating among the slaves. Not even a steersman has the "Leon." All light has gone out from her, and the "Rodeur" sheers away, leaving her to an unknown fate, for never again is she heard from. How wonderful the fate--or the Providence--that directed that upon all the broad ocean teeming with ships, engaged in honest or in criminal trade, the two that should meet must be the two on which the hand of God was laid most heavily in retribution for the suffering and the woe which white men and professed Christians were bringing to the peaceful and innocent blacks of Africa.