The principal food of the negroes is a sort of thick paste called Manioc, which is prepared from Tapioca by kneading in hot water; to an European palate it has a disagreeable flavour, but may be nutritious, as the slaves mostly look well-fed; I doubt, however, its being wholesome without a mixture of other food, and I even think it possible that it may be the original cause of a terrible disease to which the negroes alone are subject, and of which they know nothing in their own country. Large tumours appear on their faces and legs, which do not break, but increase in size till in some of the sufferers the human form can scarcely be recognised. A convent situated on a little island, called Dos Fradres, in the bay of Rio Janeiro, and not far from the town, contains a hospital, under the superintendence of the government, for sick negro slaves. I have not been able to learn whether this disease has been successfully treated here. The father of the Emperor, while he remained in Rio Janeiro, often visited the convent; and a room is shown where he used to take refuge when it thundered, as he was excessively fearful in a storm, and, from some unknown cause, esteemed this chamber peculiarly safe. On the 19th of November, the celebration of the anniversary of the coronation, and the establishment of the Order of the Southern Cross, attracted me to the capital. It was scarcely daybreak when the thunder of the cannon from all the batteries, and from the ships in the roads, recalled the remembrance of this happy event, which had taken place only the preceding year. The streets were filled with people; soldiers in their dress-regimentals hastened to their various places of rendezvous; and the negroes, released from labour, formed a part of the cheerful throng. At eleven o'clock, the Emperor and Empress, in a magnificent carriage drawn by eight horses, and escorted by a troop of guards in handsome uniforms, arrived at the principal church. A number of carriages, containing the suite of the Imperial pair, followed, all at a slow pace, that the people might have more time to enjoy the spectacle.