WORKS OF THOMAS H. HUXLEY. 



Physiography. 



An Introduction to the Study of Natute. With Illustra- 

 tions and Colored Plates. i2mo. Cloth, $2.50. 



Essays upon Some Controverted Questions. 



i2mo. Cloth, $2.00. 



In this volume Professor Huxley has brought together a number of his 

 more important recent essays, and has added certain new matter. Among 

 the topics discussed are "Mr. Gladstone and Genesis," '_' The Evolution 

 of Theology," " Science and Pseudo-Science," " Agnosticism," and "The 

 Rise and Progress of Paleontology." 



The Crayfish. An Introduction to the Study of 

 Zoology. 



With 82 Illustrations. i2mo. Cloth, $1.75- 



The object of Professor Huxley's new book is to afford an opportunity 

 to students to commence the study of zoology by means of a careful veri- 

 fication of nearly all that is known concerning a single animal, the common 

 crayfish. The book is properly termed an " Introduction to Zoology." 



On the Origin of Species ; or, The Causes of the 

 Phenomena of Organic Nature. 

 i2mo. Cloth, $1.00. 



American Addresses; with a Lecture on the Study 

 of Biology. 



i2mo. Cloth, $1.25. 



A Manual of the Anatomy of Vertebrated Animals. 



Illustrated. i2mo. Cloth, $2.50. 



A Manual of the Anatomy of Invertebrated Animals. 



Illustrated. i2mo. Cloth, $2.50. 



"My object in writing the book has been to make it useful to those 

 who wish to become acquainted with the broad outlines of what is known 

 of the morphology of the Invertebratay — The Author. 



Lay Sermons. 



i2mo. Cloth, $1.75. 



D. APPLETON AND COMPANY, NEW YORK. 



