Hence, in the month of June, 1830, the disease reappeared in a Persian province on the southern shore of the Caspian, and again at Astrachan, on the Volga, in July, where it prevailed with such unwonted violence that, before the close of August, more than 4,000 persons had died of it in the city, and 21,270 in the province. From its interval of repose, it would seem to have recuperated its strength and vigor for the lethean work awaiting its progress. Ascending the Volga, it reached Moscow, became prevalent there in September, and continued with great severity till February, 1831. Here it attacked, in the city, about 9,000 persons, of whom more than one-half died. Continuing its advance, it reached Riga about the middle of May, and St. Petersburg on the 26th June. From Astrachan it also directed its course towards the northern coast of the Black Sea, and thence along the course of the rivers into the central parts of Russia. It reached Poland in January, 1831, accompanied the Russian army in its various marches and encampments during the subjugation of that country, and proved very destructive in Warsaw and many other places during April and May. It appeared at Dantzic in May, and in June at Lemburg, Cracow, and various other places and sections of country, extending through Gallicia, Hungary, and reaching Berlin and Hamburg in August and September, and Vienna about the same time. Smyrna was visited in September, and Constantinople soon afterwards. It is reported that the pestilence was conveyed by a caravan from Mecca to Cairo in August, 1831, some thousands having died on the road; and, by the middle of September, 10,400 Mohammedans, besides Jews and Christians, had died of it in this latter city. Passing from the western coast of the continent, on nearly the same parallels of latitude, it found its way over the Northern Sea to the British Isles, and made a lodgment, first, on the northeastern coast of England, in October, 1831, at Sunderland, situated in latitude 55° north, whence it prevailed and extended its influence over this section, evincing the same malignant and lethean character it had manifested in its progress over the continent. Its course thus far has been marked with unparalleled fatality.