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Popular Lectures on Scientific 

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By H. Helmholtz, Professor of Physics in the University of 

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Contents. " 

 I. Gustav Magnus. In Memoriam. 

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Animal Life, 



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" It appears to me that of all the properties of the animal organism, 

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" This is in many respects one of the most interesting contributions to 

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SIGHT. 



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The Atomic Theory. 



By Ad. Wurtz, Member of the French Insti'ute. Translated by 

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The Power of Movement in Plants 



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