On the north side of the island of Java, about 6° S. lat. and 107° E. long., near the mouth of the river Jacatra, is situated Batavia, in the midst of swamps and marshes, surrounded by trees and jungle, which prevent the exhalations from being carried off by a free circulation of the air, and render the town peculiarly obnoxious to marsh miasmata. Besides this, all the principal streets are traversed by canals, planted on each side with rows of trees, over which there are bridges at the end of almost every street. These canals are the common receptacles for all the filth of the town. In the dry season their stagnant and diminished waters emit a most intolerable stench, while in the wet season they overflow their banks and leave a quantity of offensive slime. From these united causes, it is not surprising that Batavia has been considered the most unhealthy spot in the world, and has been designated the store-house of disease. According to Raynal, the number of sailors and soldiers alone who died in the hospitals averaged 1,400 annually for sixty years, and the total amount of deaths in twenty-two years exceeded a million of souls. The city was inclosed by a wall of coral rock, with a stream of water on each side within and without. Few Europeans, however, sleep within the town, as the night air is considered very baneful. The inhabitants, possibly, as an antidote against the noxious effluvia arising from the swamps and canals, continually burn aromatic woods and resins, and scatter about a profusion of odoriferous flowers, of which there are great abundance and variety. During the prosperity of the Dutch East India Company, Batavia obtained the title of Queen of the East, as the resources of all other districts were sacrificed to its exclusive commerce. Here, in this noted locality, was the Cholera bred and reared in 1629, under circumstances of great significance, admirably adapted to convey some idea of its cause and character. A learned professor, speaking of the diseases of India, observes: "CHOLERA is the most acute of acute diseases. It seems to have existed in Batavia as far back as 1629; and it has been known to prevail as an occasional epidemic in India at different years and places from 1774 to 1817. Since then it has been endemic, and is a disease whose germs are essentially maintained in, or upon the soil. It annually recurs at many of our large stations, commencing generally at the beginning of the hot season, but sometimes occurring in the rainy and cold season. Its greatest proclivity to propagation is amongst populations living in low, damp, crowded, and ill-ventilated situations, especially if the water supply is impure. Nearly all the diseases fatal in India are accompanied by profuse discharges, with which the air, water, linen, bedding, closets, walls of hospitals, and barracks become more or less infected; so that the 'Materies Morbi' come into contact with all the inmates of buildings where the disease prevails."