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NATURAL HISTORY and PHYSICAL 

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Professor Helmholtz' 



Popular Lectures on Scientific Sub- 

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Professor Helmholtz on 



the Sensations of Tone, as a Physio- 

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Ganot's Natural Philo- 

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The Correlation of Phy- 

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Weinhold's Introduction 



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A Treatise on Magnet- 

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Heat a Mode of Motion. 



By JOHN TYNDALL, F.R.S. Fifth 

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Sound. By JOHN TYNDALL, 



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Contributions to Mole- 

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Professor Tyndall's Re- 

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Principles of Animal Me- 

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