
Art. LVI.—Rats and Plague.
[Read before the Wellington Philosophical Society, 28th August, 1900.]
The publicity lately given to the fact that rats are subject to bubonic plague, and disseminate the disease, reminds me that during my colonial residence of close on half a century, and mostly occupied in survey-work in the bush, I have noticed at intervals of about seven years a great mortality amongst these troublesome little animals. In such seasons dead ones lay about in large numbers, particularly in the vicinity of water, while many others were too weak to get out of the way of ourselves and our dogs. The mortality always began about the time when the peaches were ripe, and lasted till the winter. I then thought it arose from the rats eating some poisonous plant which was unusually plentiful in those seasons, or possibly from some fungus of the nature of ergot rendering their food unwholesome; but I now think the disease may possibly have been some form of plague. In the same seasons there was a similar mortality among the wild pigs, numbers of which died, while the rest became so poor that we could hardly get one that was fit to eat. I thought this might arise from the pigs eating the dead rats, as I could not see anything to account for it otherwise; but I think these facts worth mentioning.
The connection between rats and plague seems generally regarded as a new discovery, but, curiously enough, we have very old evidence to the contrary. When Sennacherib in-vaded Egypt, about the year 850 B. C., he collected his forces at Lachish (now Tel el Hes), a town in the extreme south of Palestine, at which the routes from the various parts of the Assyrian Empire converged. Some of these routes crossed the Jordan at different points, while others crossed what is now Arabia Deserta and came round the southern end of the Dead Sea. When all were assembled Sennacherib crossed the Egyptian frontier and laid siege to Pelusium, a city situate beside the easternmost branch of the Nile. Here a pestilence broke out among his troops, and in a short time

killed so many that the rest had to return to the high healthy table-land of Moab to save their lives. This is the simple account given in an Egyptian inscription deciphered about twenty years ago. With our modern knowledge we can tell exactly what occurred. The natural home of the plague, from which it is never absent, and from which it always starts on its devastating rounds, is the swampy region along the lower Tigris and Euphrates. A contingent from the locality, no doubt, carried the disease to Lachish, but at first it attracted no special notice. When, however, it found itself in so congenial a region as the swampy delta of the Nile it spread with great rapidity, and compelled the raising of the siege. The plague is always very fatal in Egypt. Lowe, in his work on that country, says that in 1837 it carried off in a few weeks, in Cairo, a number of people greater than the whole male population of the city, so we can quite understand how Sennacherib's army suffered.
Herodotus, however—who is generally supposed to have written about 2,300 years ago, but whose book, in the form in which we have it, is certainly not of much earlier date than 100 B.C.—attributes the disaster to rats, vast swarms of which, he says, invaded the Assyrian camps and rendered the troops powerless by devouring their bowstrings and the leathern handles of their shields. His account, like the Egyptian one, attributes the disaster to the intervention of the Egyptian gods; and he adds that the rat was thenceforth regarded as a sacred animal in Egypt. The disaster is also mentioned in the Bible, though, of course, in a distorted and exaggerated manner, as if it had occurred when Sennacherib was besieging Jerusalem, which was not the case. Indirectly, however, it no doubt did affect the Jews. Hezekiah was clearly a partisan of Egypt, and it is quite intelligible that when Sennacherib broke up his camp at Lachish and advanced into Egypt he left a small force behind him to hold the Jews in check and keep them from interrupting his communications, and that when the main army had to retire this force was also withdrawn, and so the Jews were relieved from the anxiety which its presence had caused them.
The Assyrian account, found in Sennacherib's palace at Nineveh, and now in the British Museum, says nothing about the pestilence, and attributes the return of the army to rebellious risings at home; in fact, it mixes up this affair with the previous war, in which Hezekiah is said to have joined with other neighbouring kings in rebelling against Sennacherib, and to have been punished by being deprived of a number of towns and compelled to hand over to Sennacherib not only a large amount of money and valuables, but also his wives, his concubines, and his singing-men and singing-women. In fact,

Sennacherib represents the invasion as successful, and attributes the success to the Assyrian gods, just as the Biblical account ascribes the disaster to the intervention of the Jewish God Yahveh, whose name we English for the last two or three hundred years have mispronounced “Jehovah.”
Note.—A passage referring to the connection between rats and the plague is probably not generally known, and may be of interest. In the travels in China of the late Captain Gill, published in 1883, under the title of “The River of Golden Sand,” the writer, when speaking of the great Mahometan rebellion a few years previously, says, “During the rebellion a horrible epidemic, like the plague, appeared, that, first of all, attacked the rats. These animals used to die about the houses for a few days, and then they would migrate in vast numbers from the towns to the fields. After this the disease seized upon the miserable population, and carried off an enormous number of the people.”
