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Delivered before the _Royal Society. BY M. ROUX ON BEHALF OF M11. LOUIS PASTEUR. Mlembre de l'Institut. In troduction.-Jennerian Vaccination.-'I'he Discovery of the Artificial Attenuation of TVirus.-Pasteur's Researches on Ferments.-Researches on Chicken Cholera.-Attenuating Influence of the Air.-Anthrax. Virus: its Attenuation or IntensiJication.-Preventive Inoculationfor Rabies.-Statistics of Treatment at the l'asteur Institute.-The Poisons Manufactured by Microbes.-T'he Physiological Question.-The Action of Phagocytes.-The Sear ch for Anti(lotes. GENTLEMEN,-In the year 1881, NI. Pasteur laid before the members of the International Congress assembled in London an account of recent researches carried on in his laboratory, on the subject of preventive inoculations for chicken cholera and splenic fever. Since that time nearly eight years have elapsed, and we may ask ourselves what has become of the work then begun: has it fulfilled its promise, and whatpluce have the new principleswhich it involved taken in the science of today ? It was on these questions that NI. I'asteur intended to have spoken to you this afternoon, but the state of his health did not permit of his availing himself of the honour done him by the President and Council of the Royal Society in asking him to give the Croonian lecture this year. Ile therefore proposed that I should speak in his name, though personally I cannot hope to speak as he would have done of the preventive inoculations whiclh he himself thought out and initiated. My sole title for addressing you is that of my being M. Pasteur's

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