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NATURAL PHILOSOPHY FOR GENERAL READERS 

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GIBSON. A TEXT-BOOK OF ELEMENTARY BIOLOGY. 

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dOODEyE.— WORKS by T. M. GOODEVE, M.A., Barrister-at- 



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PRINCIPLES OF MECHANICS.' New Edition, re-written and 

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A MANUAL OF MECHANICS : an Elementary Text-Book for 

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HELMHOLTZ.— W^OJfiT^ by HERMANN L. F. HELMHOLTZ^ 



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ON THE SENSATIONS OF TONE AS A PHYSIOLOGICAL 

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