According to habit, a certain sum of stimulus is requisite to keep up the necessary excitement; and this sum cannot be immediately and suddenly withdrawn in weak subjects without some risk; in health, perhaps, the experiment may be safely made at all times, and under any circumstances, although it might be wiser to operate the change by degrees; and it must moreover be recollected, that an habitual drunkard is in a morbid condition, and must be treated accordingly.
Six causes chiefly exert their influence upon life:
1. Climate and soil.
2. Difference of races.
3. Complexion and stature.
4. Period of development during gestation, and of subsequent growth.
5. Mode of living.
6. Moral emotions, occupations.
Climates that are moderately cold are more favourable to long life. This observation equally applies to the vegetable kingdom; and trees that have scarcely attained their full growth in northern regions are drooping in the south. There also we find beasts and birds resisting the inclemency of the weather by the thickness of their coats and plumage, or a layer of grease; while many animals burrow in the earth to seek a state of torpor and insensibility, until restored to active life by a more genial temperature. Dryness of soil is another source of health and life; and the hardy mountaineer’s existence is seldom abridged by the diseases that visit the inhabitants of damp and swampy regions. Steril plains are more salubrious than regions covered with a rank and exuberant vegetation, or highly cultivated grounds, from many obvious reasons. The humid earth is not turned up, and decayed vegetable substances are not acted upon in a deleterious manner by the solar heat. When we consider the various causes of disease that must abound in crowded and corrupt cities, we might imagine that mortality would be much greater than in the country; yet observation has not proved this difference to be as material as one might expect, at least as regards disease, the sad effects of poverty and starvation not being taken into account. Various reasons may be assigned for this apparent anomaly. In cities a more regular state of excitement prevails, and man’s constant occupations scarcely give him time to attend to slight ailments, that, under other circumstances, might be aggravated. Moreover, intermittent fevers and visceral affections are more frequent in the country; and cottagers are exposed to more constant damp and severer revolutions in the atmospheric constitution than citizens. The mortality amongst men is greater in cities than in women; the latter do not enjoy so long a life in the country. March and April have been found the most fatal months. They are periods of atmospheric transition from cold to a higher temperature, and must therefore prove trying to the weak and the aged. The end of autumn is also deemed a sickly period; and the equinoxes have ever been considered critical, the solstices much less injurious. In Great Britain and the north-westerly regions of Europe, northerly and easterly winds are more prevalent in March, April, and May, owing, it is supposed, to the currents established to replace the warmer air, as it rises from the surface of the Atlantic and more southerly countries. These winds are generally dry and cold, followed by fogs, and give rise to catarrhs, bronchial and pulmonary affections. It is calculated that in our climes pulmonary affections carry off one-fifth of the population, or 191 in 1000.
In regard to the variety of races, it has been observed that those people who sooner attain pubescence are the shortest-lived. Precocious excitement must bring on premature old age. Negroes seldom attain an advanced period of life; and the progress of years is more rapidly descried in their features and their form than in Europeans who have migrated to their clime. The negroes of Congo, Mozambique, and Zanguebar, seldom reach their fiftieth year. In northern latitudes longevity is more frequent: this is observed in Sweden, Russia, Poland, Norway. Some writers have looked upon the established religion of a country as influencing the duration of life; and Toaldo asserted that Christians are shorter-lived than Jews. To this observation it may be remarked, that Jews are in general a very sober, industrious, and active race, circumstances that must materially tend to prolong their days. Moreover, by their legislation they are very careful in the choice of the meat they consume. In Catholic countries fasting may be taken into calculation, not from the effects of abstemiousness, which would be more favourable to health than injurious, but the sudden return to feasting and gormandizing, by way of revenge, when the fast is over. Shrove Tuesday and Easter Sunday are noted in red letters in the gastronomic almanac; and the suppers that follow the midnight masses of Christmas generally require the apothecary’s aid on the following morning.[46]