Not one mortal case has occurred. Not one of the patients has been dangerously ill.... None of the patients, namely above 60, inoculated with the Smallpox, subsequently to the Vaccine Disease, took the infection.... In many of the cases eruptions of the body appeared, some of which could not be distinguished from the Smallpox. I have sent the matter of Cowpox pustules on the thread enclosed, in order, if you approve of the inquiry, to inoculate with it; and I entreat you to favour me with the result of your trials: but I must trouble you to apply the test of inoculating with variolous matter subsequently to the vaccine disorder. GEORGE PEARSON, M.D., F.R.S. P.S.--I am happy to be able to state that at Berkeley, Dr. Jenner has continued his trials of inoculation with vaccine matter sent from London with good success. Jenner was of an indolent disposition, but the part Pearson was playing stung him to action. His nephew, Rev. G. C. Jenner, wrote to him from London, and thus roused his jealousy-- NORFOLK STREET, _11th March, 1799_. After what Mr. Paytherus has written to you it will be needless for me to say anything to urge the necessity of your coming to town to wear the laurels you have gained, or to prevent their being placed on the brows of another.... Dr. Pearson is going to send circular letters to medical gentlemen to let them know that he will supply them with Cowpox matter upon their application to him, by which means _he_ will be the chief person known in the business, and consequently deprive you of that merit, or at least a great share of it, which is so justly your due. Dr. Pearson gave a public lecture on the Cowpox on Saturday, and adopted your opinions, except with regard to the probability of the disease originating in Horses’ heels.... All your friends agree that _now_ is your time to establish your fame and fortune; but if you delay taking a personal active part any longer, the opportunity will be lost for ever.--Your affectionate nephew, G. C. JENNER. Jenner at once communicated the alarming intelligence to his friend Gardner with a sly suggestion for counter-action-- BERKELEY, _Wednesday_. A letter just received from G. Jenner informs me that Dr. Pearson on Saturday gave a public lecture on the Cowpox, and that it was publicly exhibited at Sir Joseph Banks’s on Sunday evening. He has also given out that he will furnish any gentleman at a distance with the virus. As this is probably done with the view of showing himself as the first man in the concern, should not some neatly drawn paragraphs appear from time to time in the public prints, by no means reflecting on the conduct of P., but just to keep the idea publicly alive that P. was not the author of the discovery--I mean of Cowpox Inoculation.--Yours truly, E. J.