In the course of the investigation I found that some of those _who seemed to have undergone the Cowpox_, nevertheless, on inoculation with the Smallpox, felt its influence just the same as if no disease had been communicated to them by the Cow. This occurrence led me to inquire among the medical practitioners in the country around me, who all agreed in this sentiment, that the Cowpox was not to be relied upon as a certain preventive of the Smallpox. This for a while damped, but did not extinguish my ardour; for as I proceeded I had the satisfaction to learn that the Cow was subject to some varieties of spontaneous eruptions upon her teats, that were all capable of communicating sores to the hands of the milkers, and that whatever sore was derived from the animal was called in the dairy the Cowpox. Thus I surmounted a great obstacle, and, in consequence, was led to form a distinction between these diseases, one of which only I have denominated the _true_, the others the _spurious_ Cowpox, as they possess no specific power over the constitution. Here we have the trick before us at the very point of transformation. He consulted with medical practitioners, “who all agreed that Cowpox was not to be relied upon as a certain preventive of Smallpox.” True. What did he do next? He discovered that what Cowpox did not prevent, the variety derived from Horsegrease did. Such was the original revelation of 1798. In 1801 we have a different story, and his quest a different issue. Not a word about the discovery of the sure preventive in Horsegrease Cowpox--not one word! Although his ardour was damped by the medical evidence against Cowpox, he yet prosecuted his inquiry; and to his satisfaction ascertained that what the milkers called Cowpox was not always Cowpox, but that any sores whatever derived from the Cow were so designated. He therefore was led to form a distinction between the diseases, and to denominate one as _true_ and the others as _spurious_ Cowpox. Thus the Horse, the obnoxious Horse, was got rid of, and the Cow represented as of herself yielding pox, which pox was the Cowpox that Pearson and Woodville (in contempt of Jenner’s 1798 revelation) had brought into fashion; and which it had become all essential for Jenner to claim as his own in order to realise his “fond hope of enjoying independence.”