The great sickness reached Italy in the early days of 1348. The report at Avignon at the time was that three plague-stricken vessels had put into the port of Genoa in January, whilst from another source it would appear that at the same time another ship brought the contagion from the East to Venice. From these two places the epidemic quickly spread over the entire country. What happened in the early days of this frightful scourge is best told in the actual words of Gabriel de' Mussi, who possessed special means of knowledge, and who has until quite recently been looked upon, but incorrectly, as a passenger by one of the very vessels which brought the plague from the Crimea to Genoa. The history of the progress of the plague may be gathered from the pages of the detailed chronicles, which at that time recorded the principal events in the various large and prosperous cities of the Italian peninsula, as well as from the well-known account of the straits to which Florence was reduced by the sickness, given in the introduction to the "Decameron" of Boccaccio. On reviewing in detail the testimonies from every land relating to this great calamity, it is impossible to overlook the sameness of the terms in which writers the most diverse in character, and in places far distant from one another, describe what passed before their eyes. It has already been remarked that the imperial historian, John Cantacuzene, in recounting the horrors of the plague in Constantinople, has borrowed from Thucydides. But the same ideas, the very same words, suggest themselves involuntarily to one and all. The simple monastic annalist of the half-buried [p017] cloister in Engelberg, the more courtly chronicler of St. Denis, the notary who writes with the dryness and technicalities of his profession, but displays withal a weakness for rhetoric and gossip, _littérateurs_ like Boccaccio, whose _forte_ is narrative, or like Petrarch, delighting in a show of words, the business-like town chronicler of an Italian city, and the author who aspires to the rank of historian, the physician whose interest is professional, even the scribbler who takes this strange theme as the subject for his jingling verse, all speak with such complete oneness of expression that it would almost seem that each had copied his neighbour, and that there is here a fine theme for the scientific amusement known as "investigation of sources." It is only when we come to examine the whole body of evidence that there is borne in upon the mind a realisation of the nature of a calamity which, spreading everywhere, was everywhere the same in its horrors, becoming thus nothing less than a world-wide tragedy, and it is seen that even the phrases of the rhetorician can do no more than rise to the terrible reality of fact.