You have seen the City as it appeared to one who walked about its streets and watched the people. It was free, busy and prosperous, except at rare intervals, when its own internal dissensions, or the civil wars of the country, or the pretensions of the Sovereign, disturbed the peace of the City. Behind this prosperity, however, lay hid all through the middle ages, and down to two hundred years ago, four great and ever-present terrors. The first was the Terror of Leprosy: the second the Terror of Famine: the third was the Terror of Plague: the last was the Terror of Fire.

As for the first two, we have seen how lazar houses were established outside every town, and how public granaries were built. Let us consider the third. The Plague broke out so often that there was hardly any time between the tenth and the seventeenth century when some living person could not remember a visitation of this awful scourge. It appeared in London first—i.e. the first mention of it occurs in history—in the year 962: again in 1094: again in 1111: then there seems to have been a respite for 250 years. In the year 1348 the Plague carried off many thousands: in 1361 it appeared again: in 1367 and in 1369. In 1407 30,000 were carried off in London alone by the Plague. In 1478 a plague raged throughout the country, which was said to have destroyed more people than the Wars of the Roses. But we must accept all mediÆval estimates of numbers as indicating no more than great mortality. With the sixteenth century began a period of a hundred and sixty years, marked with attacks of the Plague constantly recurring, and every time more fatal and more widespread. Nothing teaches the conditions of human life more plainly than the history of the Plague in London. We are placed in the world in the midst of dangers, and we have to find out for ourselves how to meet those dangers and to protect ourselves. Thus a vast number of persons were crowded together within the walls of the City. The streets were all narrow: the houses were generally of three or more stories, built out in front so as to obstruct the light and air; there were many courts, in which the houses were mere hovels: there was no drainage: refuse of all kinds lay about the streets: everything that was required for the daily life was made in the City, which added a thousand noisome smells and noxious refuse. Then the Plague came and carried off its thousands and disappeared. Then the survivors went on their usual course. Nothing was changed. Yet the Plague was a voice which spoke loudly. It said 'Clean yourselves: cease to defile the soil of the City with your decaying matter: build your houses in wider streets: do not shut out the sunshine—which is a splendid purifier—or light and air. Keep yourselves clean—body and raiment, and house and street.' The voice spoke, but no one heard. Then came the Plague again. Still no one heard the voice. It came again and again. It came in 1500, in 1525, in 1543, in 1563, in 1569, in 1574, in 1592, in 1603 (when 30,575 died), in 1625 (when 35,470 died), in 1635 (when 10,400 died), and lastly, in 1665. And in all that time no one understood that voice, and the City was never cleansed. All that was done was to light bonfires in the street in order to increase the circulation of the air. After the last, and worst attack, in 1666 the City was burned, and in the purification of the flames it emerged clean, and the Plague has never since appeared. The same voice speaks to mankind still in every visitation of every new pestilence. It used to cry aloud in time of Plague: it cries aloud now in time of typhoid, diphtheria, and cholera. Diseases spring from ignorance and from vice. Physicians cannot cure them: but they can learn their cause and they can prevent.

The Plague of 1665 began in the autumn of the year before. It had been raging in Amsterdam and Hamburg in 1663. Precautions were taken to keep it out by stopping the importation of goods from these towns. But these proved ineffectual. Certain bales from Holland were landed and taken to a house in Long Acre, Drury Lane. Here they were opened by two Frenchmen, both of whom caught the disease and died. A third Frenchman who was seized in the same house was removed to Bearbinder Lane, St. Swithin's Lane, where he, too, died. And then the disease began to spread. A severe frost checked it for a time. But in March, when milder weather returned, it broke out again.

The disease, when it seized upon a person, brought upon him a most distressing horror of mind. This was followed by fever and delirium. But the certain signs of the plague were spots, pustules, and swellings, which spread over the whole body. Death in most cases rapidly followed. Some there were who recovered, but the majority gave themselves over for lost on the first appearance. Many of the physicians ran away from the infected City: many of the parish clergy deserted their churches. The Lord Mayor and Aldermen, however, remained, by their presence giving heart to those of the clergy and physicians who stayed, and by their prudent measures preventing a vast amount of additional suffering which would otherwise have fallen upon the unhappy people.