ERNST HAECKEL'S WORKS. 



Freedom in Science and Teaching. From the Ger- 

 man of Eexst Haeckel. With a Prefatory Note by T. H. 

 Huxley, F. R. S. 12mo. $1.00. 



The Evolution of Man. A Popular Exposition of the 

 Principal Points of Human Ontogeny and Phylogeny. 

 From the German of Erxst Haeckel, Professor in the 

 University of Jena, author of " The History of Creation," 

 etc. With numerous Hlustrations. In two vols., 12mo. 

 Cloth. Price, $5.00. 



The History of Creation ; or, the Development of the 

 Earth and its Inhabitants by the Action of Natural Causes. 

 A Popular Exposition of the Doctrine of Evolution in 

 general, and of that of Darwin, Goethe, and Lamarck in 

 particular. From the German of Erxst Haeckel, Pro- 

 fessor in the University of Jena. The translation revised 

 by Professor E. Ray Lankester, M. A., F. R. S., Fellow of 

 Exeter College, Oxford. Illustrated with Lithographic 

 Plates. In two vols., 12mo. Cloth, $5.00. 



Popular Lectures on Scientific Subjects. By H, 



Helmholtz. Translated by E. Atkinson, Ph. D., F. C. S. 

 With an Introduction by Professor Tyndall. 12mo. Cloth, 

 $2.00. 



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 price. 



D. APPLETON & CO., Publishers, 



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