LITERATURE CITED 



BALTZER, F. Was haben die biologischen Schaften an fester Er- 

 kenntnis fur die Bildung ciner Weltanschauungen zu bieten? 

 Referaten der Aarauer Studentenkonferenz, 1920. 



BECKER, S. Seele, Handlung und Zweckmassigkeit in Reich der 

 Organismen. Ann. des Naturphilos. Bd. 10, 1910. 



BENEDICT, FRANCIS G. Muscular Work: A Metabolic Study with 

 Special Reference to the Human Body as a Machine. Washing- 

 ton, D. C, 1913- 



BERGSON, H. Creative Evolution. New York, 1911. 



BOVERI, TH. Die Organismen als historische Wesen. Wiirzburg, 

 1906. 



BROOKS, W. K. The Foundations of Zoology. New York, 1899. 

 BUTLER, SAMUEL Evolution, Old and New. London, 1879. 



CHILD, C. M. An Analysis of Form Regulation in Tubularia; II 

 Differences in Proportion in the Primordia. Arch. Entw. Mech. 

 23, 1907. 



CONKLIN, E. G. The World's Debt to Darwin. Proc. Am. Philos. 

 Society, 48, 1909. 



Heredity and Environment, 5th Ed. Princeton, 1922. 

 The Direction of Human Evolution. New York, 1921. 

 The Rate of Evolution. Scientific Monthly, June, 1920. 



COPE, E. D. The Primary Factors of Organic Evolution. Chicago, 

 1896. 



CUE'NOT, L. La Genese des Especes Animates. Paris, 1911. 



DARWIN, CHARLES The Origin of Species, 6th Ed. London, 1872. 

 The Descent of Man. New York, 1871. 



Variation of Animals and Plants under Domestication, 2nd Ed. 

 New York, 1876. 



Formation of Vegetable Mould through the Action of Worms. 

 New York, 1882. 

 Life and Letters. New York, 1887. 



DARWIN, ERASMUS Zoonomia, or The Laws of Organic Life. 

 Dublin, 1800. , 



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