LIST OF WORKS REFERRED TO IN TEXT. 377 
38. Hermann Helmholtz, Populire wissenschaftliche Vortrige. 
Braunschweig, 1871. 
(Hermann Helmholtz, Popular Scientific Lectures. Brunswick, 
1871.) 
39. Alexander Humboldt, Ansichten der Natur. Stuttgart, 
1826. — 
(Alexander Humboldt, Views of Nature. Styttgart, 1826.) 
40. Moritz Wagner, Die Darwin’sche Theorie und das 
Migrationsgesetz der Organismen. Leipzig, 1868. 
(Moritz Wagner, Darwin’s Theory and the Law of the Migra- 
tion of Organisms. Leipzig, 1868.) 
41. Rudolf Virchow, Vier Reden iiber Leben und Kranksein. 
Berlin, 1862. 
(Rudolf Virchow, Four Discourses on Life and Disease. 
Berlin, 1862.) 
42. Friedrich Miiller, Ethnographie (Reise der dster- 
reichischen Fregatte Novara. Anthropologischer Theil. 3 
Abtheilung). Wien, 1868. 
(Friedrich Miller, Ethnography (Voyage of the Austrian 
Frigate Novara. Anthropological Part. 3rd Part). Vienna, 
1868.) 
43. Inudwig Biichner, Die Stellung des Menschen in der 
Natur, in Vergangenheit, Gegenwart und Zukunft. Leipzig, 
1870. 
(Imdwig Biichner, Man’s Place in Nature in the Past, the 
Present, and the Future. Leipzig, 1870.) 
44. John Lubbock, Prehistoric Times. London, 1867. 
45. Herbert Spencer, A System of Philosophy. (1. First 
Principles. 2. Principles of Biology. 3. Principles of 
Psychology, etc.) London,1867. 2nd Edition. 
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