We cannot follow the details of the successful introduction of vaccination as by a triumphal progress all over the world, proving its efficacy on men of all colour, of all civilisations, of all climates. Sir Ralph Abercrombie’s expedition to Egypt was the first armed force submitted to vaccination, and its good effects were most evident. At Palermo it was not unusual to see on the mornings of public inoculation at the hospital a procession of men, women, and children, conducted through the streets by a priest carrying a cross, on the way to be inoculated. The medical officers of the British navy in 1801 presented Dr. Jenner with a gold medal in honour of his discovery. Smallpox was still committing great ravages in India and Ceylon, and Jenner exerted himself to the utmost to transmit vaccine matter to the East. The early attempts all failed, some from accident, such as the loss of an East Indiaman at sea, others from inexperience in sending the virus so great a distance, exposed to such vicissitudes of climate. Dr. Jenner proposed to the Secretary of State to send in some ship to India a number of soldiers who had not had smallpox, and to vaccinate them in succession by appointing a skilled surgeon to accompany the vessel; but those in office could not see the wisdom of this plan. Consequently the noble discoverer resolved himself to do what was so needful, and while seeking to defray part of the cost by a public subscription, he headed it with a subscription of a thousand guineas. But before the project could be matured, news arrived of the successful introduction of vaccine matter into Bombay, in consequence of its successive transfer to Constantinople, to Bagdad, to Bussora, and thence by sea to Bombay. The self-denying enthusiasm of Dr. Jenner is, however, as conspicuous as if his expedition had been fitted out as he intended. The simple narrative which the great man himself gave in 1801 in a pamphlet only extending to eight pages, deserves reproducing in every account of the discovery. Its simplicity is more forceful than any decorative treatment could have rendered it. “My inquiry into the nature of the cowpox commenced upwards of twenty-five years ago. My attention to this singular disease was first excited by observing, that among those whom in the country I was frequently called upon to inoculate, many resisted every effort to give them the smallpox. These patients I found had undergone a disease they called the cowpox, contracted by milking cows affected with a peculiar eruption on their teats. On inquiry, it appeared that it had been known among the dairies time immemorial, and that a vague opinion prevailed that it was a preventive of the smallpox. This opinion I found was comparatively new among them, for all the older families declared they had no such idea in their early days.” * * * * *