Dr. Baillie then gave his influential judgment. He thought cowpox an extremely mild disease, and when a patient had properly undergone it, he was perfectly secure from the future infection of smallpox: and further, if Dr. Jenner had not chosen openly and honourably to explain to the public all he knew upon the subject, he might have acquired a considerable fortune. In his opinion it was the most important discovery ever made in medicine.
Mr. David Taylor, surgeon of Wootton-under-Edge, had inoculated about two thousand persons with cowpox without a single failure, nor had he met with any ulcerations, tumours, or other diseases following the operation. He knew Jenner’s practice in Gloucestershire. It was in a very populous neighbourhood where there was not another physician within sixteen miles. He had surrendered an income of £600 a year to devote himself to the public service.
As a final specimen of this medical evidence I may cite Mr. John Ring, the petitioner’s henchman. He considered Jenner the author of Vaccine Inoculation, a discovery the most valuable and important ever made by man. It was a perfect and permanent security against smallpox. He had himself inoculated about 1200, of whom a thousand had exposed themselves to smallpox infection with impunity. There was no danger whatever from the New Inoculation unless from ignorance and neglect. One in every hundred inoculated with smallpox in London died, owing to the unwholesome atmosphere and the necessity of operating on children at an improper age. If Jenner had kept his discovery to himself he might have made £10,000 a year by it; for others had got as much or more by the practice of physic.
This evidence, better than any secondary description, will enable the reader to appreciate the prevalent furore as it affected the leaders of the medical world. At the same time it is to be borne in mind that the craze was superficial. Any radical change in conviction or practice is never accomplished thus easily or thus rapidly. The medical men who bore witness for cowpox had been bred to inoculation with smallpox, for which cowpox was substituted. The change was essentially trivial. The trouble, the danger, and the uncertainty of variolous inoculation were generally recognised, and when cowpox was recommended as a mild form of smallpox, it was not difficult to appreciate the asserted advantage: for, as it was argued, no one can have smallpox twice, and as the mildest attack of smallpox is as prohibitive of a second attack as the severest, therefore cowpox (which is smallpox in mild form) must protect as effectually when inoculated. With logic so admirable, it was in nowise wonderful that so many were carried away; but unfortunately, as so often happens, matter-of-fact did not correspond to the admirable logic.
The Duke of Clarence testified that he had availed himself of Jenner’s discovery from the outset. His children, his household and farm servants were all protected. A postillion positively refused to be operated on, and eighteen months after he caught smallpox in the most virulent form. Children who had undergone cowpox were constantly in the room where the lad lay and suffered no harm.
The Earl of Berkeley had his son inoculated with cowpox by Dr. Jenner at the age of six months. One of his maid-servants took smallpox and died, and the effluvia during her illness was so offensive that his servants had to move to another part of the house. To test the reality of his son’s protection, he sent for Jenner, and got him to inoculate the boy with pox from the maid. The child was found to be proof, for the inoculation had no effect—To illustrate the validity of the Gloucestershire tradition, he related how a man of 72 in his service had caught cowpox when a boy of 15 whilst milking, and in consequence always reckoned himself secure from smallpox, exposing himself to the disease with complete indifference.
Lord Rous gave similar evidence. His child had been inoculated with cowpox at the age of three months, and he was perfectly satisfied that he could never have smallpox.
Then there were lay practitioners, of whom Jenner’s nephew, the Rev. G. C. Jenner, may be taken as an example. He bore witness that he had inoculated 3000 with cowpox without a single unfavourable case, from the earliest infancy to eighty years of age, and under circumstances in which it would not be prudent to use variolous virus; as, for example, children during teething and women in every stage of pregnancy. Upwards of two hundred of his patients had been afterwards inoculated with smallpox matter, and an equal number exposed to variolous effluvia, and in no instance did smallpox ensue. He was satisfied that as soon as the new practice became universal, smallpox would be annihilated.
An early date being wanted for “the discovery,” Edward Gardner, wine and spirit dealer, was brought from Gloucester to affirm that he had known Jenner for more than twenty-two years, and had been in the constant habit of hearing his medical opinions and discoveries. It was in the month of May, 1780, that Jenner first informed him concerning the nature of cowpox as a sure preventive of smallpox, and of the theory he had formed on the subject; declaring his full and perfect confidence that the virus might be continued in perpetuity from one human being to another until smallpox was extinguished.
It is needless to stigmatise Gardner’s testimony afresh. It possibly had its foundation in Jenner discussing the familiar rural faith in cowpox. Sir Everard Home mentioned to the Committee that Jenner had brought a drawing to London in 1788 of Variolæ Vaccinæ as it appeared on the finger of a milker, and had shown it to John Hunter, who advised him to look further into the matter; but it was not pretended that he spoke to Hunter of the matured conviction revealed to Gardner eight years before.