III.

The next great influenza, twenty years after, which was in America in the spring of 1781 and in Europe in the winter and spring following, will repay the same kind of scrutiny. There had been influenza here or there in Europe since the beginning of 1780, but no great epidemic of it; and in England, as elsewhere, there had been epidemic agues and dysenteries since that year, or the autumn before. The epidemic agues became worse in England in 1783, 1784, and 1785, appearing in places which had never been thought malarious. The whole period from 1780 to 1784 was remarkable for hot and dry summers and great earthquakes. Italy and Sicily were troubled by earthquakes to an unusual extent in 1780, 1781, 1782, and 1783; they were so frequent in 1781 that the pope ordered public prayers. The great earthquake of the period was in Calabria at half an hour after noon of the 5th of February, 1783, about six months after the great influenza of the period was over. Sir William Hamilton, the British ambassador at Naples, visited the numerous scenes of the earthquake in Calabria and Sicily in the first fortnight of May, 1783, and sent to the Royal Society an account of what he saw. At several places he found fever epidemic, part of it from the overcrowding and filth of the temporary barracks in which the people were living, part of it malarious from the damming of water by changes in the river beds. At Palmi the spilt oil mixed with the corn of the overthrown granaries, and the corrupted bodies, had a sensible effect on the air, which threatened an epidemic; at the village of Torre del Pezzolo an epidemical disorder had already manifested itself[766].

But the most striking effect of the earthquake was that a dry fog began in Calabria in February, and overspread until autumn the greater part of Europe, extending even to the Azores. This fog, though not consisting apparently of moisture, was so dense that the sky was quite obscured, appearing a light grey colour instead of blue, while the sun became a blood-red disc. In Calabria the darkness was so great that lights were needed in the houses, and ships came into collision at sea. There was a most disagreeable odour[767]. The fog spreading over all Europe from Calabria was not at all mythical, as we are apt to suppose that similar recorded phenomena of the wonder-loving Middle Ages may have been. The phenomenon was independently reproduced in Iceland the same year, from the 1st to the 11th of June, causing the same darkness at sea, the same atmospheric effects at a distance, but not to so great a distance, and some amount of sickness, but seemingly not aguish or febrile, among the population[768].

Those two great convulsions of the year 1783, each of them the cause of a widely spreading dry fog, may have been conceivably the cause of pestiferous miasmata in the air, such as the corresponding hypothesis of influenza requires; but how little comparable or equivalent were the miasmata--in the one case from the ancient and well-peopled soil of Southern Italy, in the other from the inhospitable Danish colony just without the Arctic Circle! In any case, the earthquakes of 1783 were both too late for the great influenza of the period. The antecedent common alike to the influenza and the earthquakes was the extraordinary droughts, which caused famine and famine-fever in Iceland, and, according to old experience, was probably related to the epidemic prevalence of agues in Britain and on the continent of Europe.