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The increased weight of the yeast is always due to the action of two distant modes of vital energy activity, namely, in presence and activity in absence of air. Such is the large volume of oxygen necessary for the development of one gramme of yeast when the plant can assimilate this gas after the manner of an ordinary fungus.
One of the means for accomplishing such multiplication was the Siemens armature of 1856. Another step of importance was that involved in the Pacinotti ring, known in its practical application as the machine of Gramme. A third step, that of the self exciting principle, was first communicated by Dr.
The rapid growth of the business in this country is almost without a parallel in history, and no invention has added more to the convenience of modern life. A distinguished scientist one day asked the late Clerk Maxwell what was the greatest scientific discovery of the last half century, and Maxwell answered without an instant's hesitation: "That the Gramme machine is reversible."
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