LIST OF WORKS REFEREED TO IN TEXT. ZIZ 



9. Victor Cams, System der thierisclien Morphologie. 

 Leipzig, 1853. 



(Victor Carus, System of Animal Morphology. Leipzig, 1853.) 



10. Louis Bilclmer, Kraft und Stoff. Empirisch-naturphilo 

 sophisclie Studien in allgemein verstandlicher Darstellnng 

 Frankfort, 1855, 3 Auflage. 1867, 9 Auflage. 



(Louis Biichner, Force and Matter. Studies in the Empirical 

 Philosopliy of Nature, treated popularly. Frankfort, 1855, 3rd 

 Edition. 1867, 9th Edition.) 



11. Charles Lyell, Principles of Geology. London, 1830. 

 10th Edition, 1868. 



12. Albert Lange, Geschichte des Materialismus und Kritik 

 seiaer Bedeutung in der Gegenwart. Iserlohn, 1866. 



(Albert Lange, History of Materialism, and a Criticism of its 

 Importance at the Present Time. Iserlohn, 1866.) 



13. Charles Darivin, Voyage of the Beagle. London. 



14. Charles Darwin, The Variation of Animals and Plants 

 under Domestication. 2 Vols. London, 1868. 



15. Ernst Haeckel, Studien iiber Moneren und andere 

 Protisten, nebst einer Rede iiber Entwickelungsgang und 

 Aufgabe der Zoologie. Mit 6 Kupfertafeln. Leipzig, 1870. 



(Ernst Haeckel, Studies on the Monera and other Protista, 

 too"ether with a Discourse on the Eyolution and the Problems 

 of Zoology. With 6 Copper-plates. Leipzig, 1870.) 



16. Fritz Mailer, Fiir Darwin. Leipzig, 1864. 



(Fritz Miiller, For Darwin. Translated by W. S. Dallas. 

 London, Murray.) 



17. Thomas Huxley, On our Knowledge of the Causes of 

 the Phenomena of Organic Nature. Six Popular Lectures. 

 London, Hardwicke, 1862. 



