March 20, 1891.] 



SCIENCE. 



167 



contained in "Applied Mechanics,"' a larger treatise on the same 

 subject, by Professor Cotterlll of the Royal Naval College, Green- 

 wich. It may therefore be described as an abridged edition of 

 the previous work. The abridgment, however, has been com- 

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— Messrs. Ginn & Co. announce " Essential Uses of the Moods," 

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