6. Professor Estrada confidently stated, that of forty-two individuals who died in the city of Ica, after having been bit by mad dogs, the greater number were cut off from twelve to ninety days after the accident. The symptoms which followed the ingraftment of the poison disclosed themselves in the form of convulsions, oppression at the breast, sighs, sadness, laborious breathing, horror at liquids and shining objects, fury, vomiting of dark bilious matter, and an incessant urgent call on the part of the patients that the assistants should depart from them, because they felt themselves impelled to attack, bite, and tear them to pieces: none in this state survived beyond the term of five days. Since the year 1808 this terrible epidemic has been disappearing. From time to time, however, a dog may be seen running violently hither and thither, and biting all whom he may happen to meet, in the same way as is done by the really mad dog.—But, in the examples wherein no bad results arise from the bite, they may be considered of the same character with the disorder observed by Mr. Colombier, which attacks dogs, renders them furious, and excites them to bite, but has, nevertheless, nothing at all of hydrophobia in it;—still, however, the safest way is to kill the dogs thus affected, and to implore the Father of mercies that these regions may never again experience so severe a visitation. Canis ore timendo, Ore vomit flammam. GERMAN ARAT. BIRDS. The shores of the South Sea are covered with myriads of birds, among which are distinguished, for their incalculable number, the Huanaes; from whose ordure, as some believe, is produced that red-coloured earth or manure (huano[54]), of a penetrating and alkaline smell, which enriches the land so much as to make it yield triple or quadruple the produce it could do without this dressing: a discovery made by the ancient Indians, who were most skilful agriculturists. Gulls, herons, ducks, and some other families of the feathered class, descend during autumn from the mountain lakes to the coast, where they remain until the commencement of summer, when they again return to the Sierra. In undertaking this journey, they take their flight in the morning in large flocks; and, as they soon come in contact with lofty barriers of mountains which oblige them to change their course, they ascend the higher regions in a winding and spiral manner, till, after numberless evolutions and gyrations, they have risen above the loftiest peaks of the Cordillera, and find themselves again at liberty to pursue their journey in a direct line. The condor[55] often stations himself in the middle of the spires,[56] either as acting the part of a guide, or to boast in proud display the strength of wing by which the most vigorous and powerful of birds can soar above all the rest of the feathered race.