“It is too well and generally known that at all seasons, and for days together in every week, the aqueducts which pass through the houses are so completely blocked up with the quantity of vegetable matter and dead animals collected in them, that they cannot transmit even the smallest stream of water. The subordinate or cross streets, and many of the principal ones, are not less filthy; and any stranger who visits Santiago will be inclined to believe that, of all the towns of South America, it is the dirtiest.[41]
“Sad experience, and especially in recent times, has taught, that during the decomposition of organized matter, whether animal or vegetable, under the action of heat and moisture, certain exhalations take place, which possess properties in the highest degree injurious to the health of man. This is a truth which is attested by a multitude of medical authors. It is the good fortune of the inhabitants of Santiago, that the atmosphere in which they breathe does not so readily absorb, or act upon substances undergoing the process of putrefaction, as to engender those dreadful epidemics, which have carried off millions of lives, and are still reaping their harvest of mortality in various parts of Spain, North America, India, Mexico, Panama, Vera Cruz,[42] and many other regions of the Old and New World.
“Were they not thus favoured by the natural salubrity of their atmosphere, the church-bells of the Chilean capital would be daily heard to toll the mournful knell of death, and every home would present the tearful scene of grief and lamentation.
“But although in Santiago the action of the atmospheric air on substances in a state of putrefaction is not so active as to produce such epidemics as those alluded to, yet it cannot be denied that it is capable of acquiring such properties as make it exercise a most baneful influence on the public health: inducing attacks of dysentery, typhus and other fevers, which, from time to time, appear epidemically. In truth, to some general cause of this nature we must attribute those violent and fatal dysenteries which were so very prevalent in the year 1826, and which recurred in the months of March and April of the present year (1828). To a similar cause must be referred that vexatious sort of puerperal fever which in the year 1827 attacked such a number of women; and also those cases of typhus or chabalongo which abound, with few exceptions, every year.
“Reasoning on the generally received principle that air at a high temperature occasions a greater degree of exhalation from bodies than cool air does, and from what we know the influence of summer heat to be in other countries, we should suppose that diseases caused by miasmatous matter should be here more common in summer than in winter; but our acquaintance with this climate induces us to think differently on this subject.
“Here, in summer, the air of the atmosphere is uniformly clear and cloudless; and the emanations from the earth’s surface, meeting neither clouds nor mists to impede their ascent, mingle with the other atmospherical ingredients, and diffuse themselves freely through the regions of space. The opposite of this takes place in winter. The heat of the sun is always very considerable, or at least sufficient to disengage from heaps of nastiness and rubbish the noxious vapours which putrefaction has generated in them. At sunset these vapours come in contact with the clouds that gather around us, and soon meet the cold air of the approaching night; the consequence of which is, that they are precipitated into the lower strata of the atmosphere, and wafted on the nocturnal breeze into the interior of our habitations. Thus a satisfactory and rational explanation is given, why there should be more sickness in winter than in summer; and by associating this view of the matter with the bad ventilation in the houses of the poor, who from their inability to provide themselves with fuel[43] and warm clothing, are compelled to exclude the free admission of air, we may perceive the reason why at this season the poor are more obnoxious to disease than those whose pecuniary circumstances enable them to protect their homes from the severities of winter by better means than the utter exclusion of the air.
“The generality of persons, overlooking the course of atmospherical changes, imagine that the diminution in the number of cases of sporadic fever observable in summer is owing to the abundant consumption of the fruits of this season. We will not deny that the use of fruit may improve to a considerable extent the health of those persons who in winter and spring have been nourished with strong and stimulating aliment, such as is calculated to disorder the digestive functions; but we are far from thinking that to the use of fruits alone are to be assigned all the good effects which the vulgar fancy they derive from them. We know that in other countries not less bounteously supplied with fruit than Chile, though not favoured with so benign a climate, epidemic diseases prevail more in summer than in winter. For these, and many other reasons which it would be superfluous to detail, we consider ourselves authorized to dissent from public opinion on this subject, and to assign the diminution in the diseases of the character alluded to, during the summer months, to causes more in conformity with medical philosophy: namely, the benign state of the atmosphere in summer; the bodily exercise which the different classes of the community indulge in every summer evening; and the wholesome ventilation which they enjoy at this season, their doors being constantly open, and many of them choosing to sleep even in the open air.”