Some light is thrown upon the state of health on board ships of war on the home station by Dr William Cockburn, physician to the fleet, afterwards the friend of Swift, who calls him “honest Dr Cockburn.” He had a secret remedy for dysentery, which he succeeded in getting adopted by the Admiralty, greatly to his own emolument for many years after. Dining on board one of the ships at Portsmouth, in 1696, with Lord Berkeley of Stratton, he brought up the subject of his electuary, and arranged for a public trial of it next day on board the ‘Sandwich.’ An uncertain number, which looks to have been about seven in Cockburn’s own account, but became seventy in the pamphlet which advertised the electuary after his death, were available for the trial and were speedily cured. Cockburn’s three essays on the health of seamen[182] leave no doubt as to the extensive prevalence of scurvy and the causes thereof; while his references to “malignant fever,” although they are, as usual, brought in to illustrate some doctrinal or theoretical point, give colour to the belief that ship-typhus may have been as common then as we know it to have been in the ships at Portsmouth and Plymouth, on the more direct testimony of Huxham in 1736, and of Lind twenty years later. A naval surgeon of the time of William III. and Anne, was induced by his enthusiasm for blood-letting in fevers to record some of his experiences on board ship[183]. It was usually the lustiest, both of the young, strong and healthy people, and likewise of the elder sort, that died of fevers, the symptoms which proved so mortal having been delirium, phrenitis, coma or stupor, whether they occurred in the συνόχοι (of Sydenham) or in the συνεχεῖς (of the same author): “I had observed in a ship of war whose complement was near 500, in a Mediterranean voyage in the year 1694, where we lost about 90 or 100 men, mostly by fevers, that those who died were commonly the young, but almost always the strongest, lustiest, handsomest persons, and that two or three escaped by means of such [natural] haemorrhagies, which were five or six pounds of blood”--the point being that the amount of blood drawn by phlebotomy should be in proportion to the robustness and body-weight of the patient.