LIST OF WORKS REFERRED TO IN TEXT, 373 
9. Victor Carus, System der thierischen Morphologie. 
Leipzig, 1853. 
(Victor Carus, System of Animal Morphology. Leipzig, 1853.) 
10. Louis Biichner, Kraft und Stoff. Empirisch-naturphilo 
sophische Studien in allgemein verstadndlicher Darstellung 
Frankfort, 1855, 3 Auflage. 1867, 9 Auflage. 
(Louis Biichner, Force and Matter. Studies in the Empirical 
Philosophy of Nature, treated popularly. Frankfort, 1855, 8rd 
Edition. 1867, 9th Edition.) 
11. Charles Lyell, Principles of Geology. London, 1830. 
10th Edition, 1868. 
12. Albert Lange, Geschichte des Materialismus und Kritik 
seiner 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 Darwin, Voyage of the Beagle. London. 
. 14. Charles Darwin, The Variation of Animals ard Plants 
under Domestication. 2 Vols. London, 1868. 
15. Ernst Haeckel, Studien iiber Moneren und andere 
Protisten, nebst einer Rede tiber Entwickelungsgang und 
Aufgabe der Zoologie. Mit 6 Kupfertafeln. Leipzig, 1870. 
(Ernst Haeckel, Studies on the Monera and other Protista, 
together with a Discourse on the Evolution and the Problems 
of Zoology. With 6 Copper-plates. Leipzig, 1870.) 
16. Fritz Miller, Fir Darwin. Leipzig, 1864, . 
(Fritz Miller, For Darwin. Translated by W. S. Dallas. 
London, Murray.) 
17. Thomas Huzley, On our Knowledge of the Causes of 
the Phenomena of Organic Nature. Six Popular Lectures. 
London, Hardwicke, 1862. 
