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Yeastby Thomas H. HuxleyI HAVE selected to-night the particular subject of Yeast for tworeasonsor, rather, I should say for three. In the first place,because it is one of the simplest and the most familiar objects withwhich we are acquainted. In the second place, because the facts andphenomena which I have to describe are so simple that it is possible toput them before you without the help of any of those pictures ordiagrams which are needed when matters are more complicated, and which,if I had