During the short visit paid to this city, in the year 1798, by Dr. Borland, a respectable physician of the British army, he put into my hands the following communication. "In the beginning of August, 1797, 109 Dutch artillery arrived at Port au Prince, in the Bangalore transport. The florid appearance of the men, their cumbersome clothing, and the season of the year, seemed all unfavourable omens of the melancholy fate we presumed awaited them. It was, however, thought a favourable opportunity, by Dr. Jackson and myself, to try what could be done in warding off the fever. It was accordingly suggested to Monsieur Conturier, the chief surgeon of the foreign troops, and the surgeon of the regiment, that the whole detachment should be blooded freely, and that, the morning after, a dose of physic should be administered to every man. This was implicitly complied with, a day or two after, and at this moment in which I write, although a period of four months has elapsed, but two of that detachment have died, one of whom was in a dangerous state when he landed. A success unparalleled during the war in St Domingo! It is true, several have been attacked with the disease, but in those the symptoms were less violent, and readily subsided by the use of the lancet. "The _crew_ of the Bangalore, on her arrival at Port au Prince, consisted of twenty-eight men. With them no preventive plan was followed. In a very few weeks eight died, and at present, of the original number, but fourteen remain." All these depleting remedies, whether used separately or together, induce such an artificial debility in the system, as disposes it to vibrate more readily under the impression of the miasmata. Thus the willow rises, after bowing before a blast of wind, while the unyielding oak falls to the ground by its side. It is from the similarity of the natural weakness in the systems of women, in the West-Indies, with that which has been induced by the artificial means that have been mentioned, that they so generally escape the malignant endemic of the islands. A second class of preventives of malignant fever are such as obviate the internal action of miasmata, by exciting a general or partial determination to the external surface of the body. These are, 1. The warm bath. I have known this grateful remedy used with success in our city. It serves the treble purposes of keeping the skin clean, and the pores open, and of defending what are called the vital organs from disease, by inviting its remote cause to the external surface of the body.