The evil effects of all this humidity, so far as they are dangerous, appear to be confined to the immediate vicinity of the river, and to the inhabitants of the city; for in the pampas the gauchos sleep upon the ground during the greater part of the year in the open air without risk. Their skins, however, like those of the cattle they watch, are probably impervious to the wet. Before I went to Buenos Ayres I had suffered much from malaria fever, caught in Greece; and when I saw, for the first time, the low, flat, marshy appearance of the whole country, I expected nothing less than a return of my old ague. Everything around seemed to bespeak it: but Buenos Ayres is free from such disorders, and cases of intermittent fever, such as that I speak of, are rarely known there. Still, though free from the malaria of the Mediterranean coasts, the sirocco of the Levant does not bring with it more disagreeable affections than the viento norte, or north wind of Buenos Ayres; indeed, the irritability and ill-humours it excites in some people amount to little less than a temporary derangement of their moral faculties: it is a common thing to see men amongst the better classes shut themselves up in their houses during its continuance, and lay aside all business till it has passed; whilst amongst the lower orders it is a fact well known to the police that cases of quarrelling and bloodshed are infinitely more frequent during the north wind than at any other time. In illustration of this, I shall quote a case in point, the account of which I received from one of the most eminent medical men in the country, who had paid particular attention during a practice of more than thirty years to its influence upon the human system.