These are instances of country-bred people, plunging abruptly into the fever-dens of cities and catching a typhus severe in the direct ratio of their ruddy, healthy condition. Another class of cases is that of persons carrying the atmosphere of a gaol into the company of healthy and otherwise favourably situated people. Howard gives a case: at Axminster a prisoner discharged from Exeter gaol in 1755 infected his family with the gaol-distemper, of which two of them died, and many others in that town. The best illustrations of the greater severity and fatality of typhus among the well-to-do come from Ireland, in times of famine, and will be found in another chapter. But it may be said here, so that this point in the natural history of typhus fever may not be suspected of exaggeration, that the enormously greater fatality of typhus (of course, in a smaller number of cases) among the richer classes in the Irish famines, who had exposed themselves in the work of administration, of justice, or of charity, rests upon the unimpeachable authority of such men as Graves, and upon the concurrent evidence of many. Ship-Fever. The prevalence of fevers in ships of war and transports from the Restoration onwards can be learned but imperfectly, and learned at all only with much trouble. Sir Gilbert Blane, who was not wanting in aptitude and had the archives of the Navy Office at his service, goes no farther back than 1779, from which date an account was kept of the causes of death in the naval hospitals. But the deaths on board ships of the fleet were not systematically recorded until 1811, when the Board of Admiralty instructed all commanders of ships of war to send to the Naval Office an annual account of all the deaths of men on board[179]. The sources of information for earlier periods are more casual.