A thousand years ago, La Brenne was covered with woods, interspersed with meadows. These meadows were watered by living streams. It was then a country famous for the fertility of its pastures and the mildness of its climate. Now the forests have disappeared. La Brenne is gloomy, marshy, and unhealthy. The same could be said of La Dombe, La Bresse, La Sologne, etc.
The following is a permanent example exactly to the point. In the Pontine marshes, a wood intercepts the current of damp air laden with pestilential miasmas, rendering one side of it healthy, while the other is filled with its destructive vapors. The places where forests have disappeared seem as if inhabited by evil genii, who eagerly seek to enter the human frame under the form of fevers, cholera, diseases of the lungs and liver, rheumatism, etc. For example, it is sufficient to breathe for only a few seconds in certain regions of Madagascar, or some of the fatal islands near by, for the whole organization to be instantly seized with mortal symptoms. The most robust and vigorous young man, who goes full of ardor to those shores with the hope of a bright future, affected by these miasmas, feels as if dying with the venom of the rattlesnake in his veins; and, if he recovers from his agony, it is often to drag out in sorrow the small remnant of his days. How many unfortunate people of this class have I not met during my voyage in the Indian Ocean. What a sacrilege to think of destroying these delicious and mysterious forests, with their atmosphere full of celestial vibrations, and their divine orchestra, where the breeze murmurs in a thousand tones the hymn which reveals the Creator to the creature! Every sorrow is soothed in the depths of those beneficent shades. There the soul, as well as the body, finds a repose which regenerates it. The divinity descends; we feel its presence. It moves us to the depths of our souls. It caresses us like the breath of the mother we adore!
Man may live to an advanced age in almost every climate, in the torrid as well as the frigid zone; but he cannot everywhere attain the utmost limit of human life. The examples of extreme longevity are more common in some countries than in others. Although, in general, a northern climate may be favorable to long life, too great a degree of cold is injurious. In Iceland, in the north of Asia—that is, in Siberia—man lives, at the longest, but sixty or seventy years. The countries where people of the most advanced age have been found, of late years, are Sweden, Norway, Denmark, and England. Individuals of one hundred and thirty, one hundred and forty, and one hundred and fifty years of age, have been found there. Ireland shares with England and Scotland the reputation of being favorable to the duration of life. More than eighty persons above fourscore years of age have been found in a single small village of that country, called Dumsford. Bacon said that he did not think you could mention a single village of that country where there was not to be found at least one octogenarian. Examples of longevity are more rare in France, in Italy, and especially in Spain. Some cantons of Hungary are noted for the advanced age to which their inhabitants attain. Germany also has a good many old people, but few who live to a remarkable age. Only a small number are to be found in Holland. It is seldom that any one reaches the age of one hundred in that country. The climate of Greece, which is as healthy as it is agreeable, is considered now, as it formerly was, favorable to longevity. The island of Naxos is specially noted in this respect. It was generally admitted in Greece that the air of Attica disposed those who breathed it to philosophy.
Examples of longevity are to be found in Egypt, and in the East Indies, principally in the caste of Brahmins and among the anchorets and hermits, who, unlike the rest of the inhabitants, do not abandon themselves to indolence and excesses of every kind.
A careful computation of the comparative longevity, in the different departments of France, has been made for 1860 and the preceding years. The medium annual number of deaths in France, at the age of one hundred years and upward, is 148. The following fifteen départements, given in decreasing order, are those which have the greatest number: Basses-Pyrenees, Dordogne, Calvados, Gers, Puy-de-Dôme, Ariége, Aveyron, Gironde, Landes, Lot, Ardèche, Cantal, Doubs, Seine, Tarn-et-Garonne. It will be seen that a great number of mountainous districts are to be found in these departments. It is surprising to see that of la Seine on this list. Nevertheless these departments do not hold the same rank in respect to the ordinary duration of life; which would seem to prove that some examples of extreme longevity are not a sufficient index that a country is favorable to long life. I give their numbers in order: Basses-Pyrénées, 7; Dordogne, 42; Calvados, 2; Gers, 9; Puy-de-Dôme, 30; Ariége, 48; Aveyron, 34; Gironde, 18; Landes, 52; Lot, 33; Ardèche, 43; Cantal, 23; Doubs, 25; Seine, 53; Tarn-et-Garonne, 13.
The fifteen departments in which ordinary life is most prolonged are: Orne, Calvados, Eure-et-Loir, Sarthe, Eure, Lot-et-Garonne, Deux-Sèvres, Indre-et-Loire, Basses-Pyrenees, Maine-et-Loire, Ardennes, Gers, Aube, Hautes-Pyrenees, et Haute-Garonne.
It is evident that places need not be very remote from each other to produce a different influence on the duration of life.
That cold is injurious to the nerves, remarks M. Reveille-Parise, is a truth almost as old as the medical art. A low temperature produces not only a painful effect upon the skin, but it benumbs and paralyzes the nerves of the extremities, and diminishes the circulation of the fluids, and this gives rise to all sorts of diseases.
Men of intellectual pursuits, having an extremely nervous susceptibility, are particularly affected by change of temperature. It is not surprising, then, to find that the mental faculties have attained their utmost degree of perfection in certain climates. Choice natures, such as poets and other men of genius, only produce the finest fruit under the influence of an ardent sun and a pure and brilliant atmosphere. It is only in warm and temperate climates that nature and life are most lavish of their treasures; there we find genuine creations; elsewhere are imitations only, with the exception of the physical sciences, which depend on continued observation. It is remarkable that, if the men of the North have conquered the South, the opinions of the South have always held sway in the North. Besides, fertility of the soil and a mild temperature set man free, in southern countries, from all present care and all anxiety respecting the future, and infuse that blissful serenity of soul so favorable to the flights of the imagination. In the misty climate of the north, he has to struggle incessantly against the influence of the weather, which so greatly diminishes the powers of the mind. This struggle is almost always a disadvantage to the minds of men, who are particularly impressible and often reduced to a state of muscular enervation. Cold, dampness, fogs, violent winds, sudden changes of temperature, frequent rains, endless winters, uncertain summers with their storms and unhealthy exhalations, are fearful enemies to an organization which is delicate, nervous, irritable, suffering, and exhausted.
The state of the atmosphere, then, acts powerfully on the mental faculties. There are really days when the mind is not clear. The thoughts, sometimes so free and abundant, are suddenly arrested. The sources of the imagination are expanded and contracted according to the degrees of the barometer and thermometer. The different seasons of the year have more influence than may be thought, upon the master-pieces of art, upon the affections, the events of life and even upon political catastrophes. History relates that Chancellor de Cheverny warned President de Thou that if the Duke de Guise irritated the mind of Henry III during a frost, (which rendered him furious,) the king would have him assassinated; and this really happened on the twenty-third of December, 1588.