WORKS OF THOMAS H. HUXLEY. 



Physiography. 



An Introduction to the Study of Nature. With Illus- 

 trations 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 

 topi-s 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. 12010. 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 verification 

 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. 12010. 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 Invertebrata" -Th6 Author. 



Lay Sermons. 



i2mo. Cloth, $1.75. 



D? APPLETON AND COMPANY, NEW YORK. 



