It was in this plausible shape that vaccination had an immediate triumph. The way was made straight for it and every difficulty removed by the existing practice of variolation. Dr. W. B. Carpenter says that vaccination was more strenuously resisted at the beginning of the century than it is at this day. He is completely mistaken. Vaccination came upon a generation prepared for it--which saw in it a prescription in full accord with common-sense. The entire medical profession, with a few exceptions, the King, Queen and court, were converted straight off, and parliament and society followed suit. It was, I confess, a natural development of opinion; and we need have little doubt that had we lived in those days we should have found ourselves shouting with the genteel mob. The limited resistance offered to vaccination was not based on physiological or sanitary science: such science did not then exist. It was the resistance of variolators who were satisfied with the established practice and resented its disturbance; professing at the same time immeasurable horror at the profanation to humanity by infection with bovine disease. Whilst we have no reason to identify ourselves with that resistance, we have to recognise the service rendered by the variolators in observing the results of vaccination--the persistency with which they traced and exposed its failure to prevent smallpox and the injuries and deaths it caused. So far as the maintenance of variolous inoculation was concerned, they fought a losing battle; but they drove the vaccinators from post to post (cursed while they did so as malignant false witnesses possessed of the devil) and at last compelled the admission that their infallible preventive could not be guaranteed to prevent, but only to make smallpox milder--a safe assertion because unverifiable, as disputable as indisputable in particular instances. JENNER’S PROCEDURE. About the matter of this prophylactic there was from the first a curious confusion which continues to this day. Jenner was a country doctor at Berkeley in Gloucestershire, a dairy country, where the maids believed that if they caught cowpox in milking they could never afterwards catch smallpox. Jenner when a young man was inclined to accept the dairymaids’ faith; but when he discussed it with his medical acquaintance, they ridiculed him. They said, “We know that such is the dairymaids’ faith, but we also know that it is untrue; for we know dairymaids who have had cowpox, and afterwards had smallpox notwithstanding their cowpox.” Jenner was convinced and said no more about cowpox. To this point let me draw special attention. No man knew better than Jenner that cowpox as cowpox was no preventive of smallpox. Toward middle-life he had what he conceived to be a happy thought. Cowpox as cowpox he had dismissed as impracticable; but there was a variety of cowpox which he resolved to recommend.