V 



KNOWLEDGE" LIBRARY. 



NATURE STUDIES. 



GRANT ALLEN, ANDREW WILSON, 



THOMAS FOSTER, EDWARD CLODD, AND 



RICHARD A. PROCTOR. 



Let knowledge grow from more to more." TENNYSON. 



LONDON : 



WYMAN & SONS, 74-76, GREAT QUEEN STREET, 

 LINCOLN'S INN FIELDS, w.c. 



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