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![Harvard classics . 346 LOUIS PASTEUR microscopical examination of these vibrios, quite out ofcontact with air, is the following. After butyric fermenta-tion has been going on for several days in a flask, ( Harvard classics . 346 LOUIS PASTEUR microscopical examination of these vibrios, quite out ofcontact with air, is the following. After butyric fermenta-tion has been going on for several days in a flask, (](https://c8.alamy.com/comp/2ANAT9B/harvard-classics-346-louis-pasteur-microscopical-examination-of-these-vibrios-quite-out-ofcontact-with-air-is-the-following-after-butyric-fermenta-tion-has-been-going-on-for-several-days-in-a-flask-fig-13we-connect-this-flask-by-an-india-rubber-tube-with-one-ofthe-flattened-bulbs-previously-described-which-we-thenplace-on-the-stage-of-the-microscope-fig-13-when-we-fig-13-wish-to-make-an-observation-we-close-under-the-mercuryat-the-point-b-the-end-of-the-drawn-out-and-bent-delivery-tube-the-continued-evolution-of-gas-soon-exerts-such-apressure-within-the-flask-that-when-we-2ANAT9B.jpg)