WORKS OF THOMAS H. HUXLEY. 



A Manual of the Anatomy of Vertebrated 



Animals. Illustrated $2. 50 



A Manual of the Anatomy of Invertebrated 



Animals. Illustrated ..... 2.50 



American Addresses 1.25 



Physiography 2.50 



The Crayfish 1.75 



Collected Essays. New complete edition, with 



revisions, in nine volumes. Per volume . , 1.25 



On the Origin of Species; or, The Causes 



of the Phenomena of Nature . i.oo 



Lay Sermons 1.75 



Controverted Questions 2.00 



D. APPLETON AND COMPANY, NEW YORK. 



