October 2, 1891. J 



SCIENCE. 



195 



fessional aiiiJ amateur; " The Principles of Perspective as Applied 

 to Model-Drawing and Sketching from Nature,"' with 33 plates 

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— Messrs. Whittaker & Co. announce the following books: In 

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Cold," by H. G. Harris; " The Dynamo," by C. C. Hawkins and 

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ATonic 



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Practical Instructions in the Art of" Reading 

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